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{{short description|American autocannon}}
{{Short description|American autocannon}}
{{redirect|M242|the Israeli Jeep derivative|AIL Storm#Storm II}}
{{Redirect|M242|the Israeli Jeep derivative|AIL Storm#Storm II}}
{{Infobox weapon
{{Infobox weapon
|name = M242 Bushmaster
| name = M242 Bushmaster
|image = M242-1.jpg
| image = M242-1.jpg
|image_size = 300
| image_size = 300
|caption = [[United States Army|U.S. Army]] press photo of the M242 Bushmaster chain gun
| caption = [[United States Army|U.S. Army]] press photo of a M242 Bushmaster
|origin = United States
| origin = United States
|type = [[Chain gun]]
| type = [[Chain gun]]
<!-- Type selection -->
<!-- Type selection -->| is_ranged = yes
|is_ranged = yes
| is_artillery = yes
<!-- Service history -->| service = 1981–present
|is_artillery = yes
⚫
| used_by = See ''[[#Operators|Operators]]''
<!-- Service history -->
|service = 1981–present
| wars = <!-- Production history -->
⚫
| designer = [[Hughes Helicopters]]<ref name=CGM>Chinn, George M., 1987, pp. 455–456.</ref><ref name=babel/>
⚫
|used_by= See ''[[#Operators|operators]]''
|wars =
| design_date = 1976
| manufacturer = Hughes Helicopters (1981–1985)<ref name=CGM/><ref name=USPTO>{{cite web |url=http://assignments.uspto.gov/assignments/q?db=tm&qt=sno&reel=&frame=&sno=73027311 |title=Trademark Assignment Abstract of Title |publisher=[[United States Patent and Trademark Office]] |date=12 November 2018 |access-date=28 April 2019 |archive-url=https://web.archive.org/web/20160507001945/http://assignments.uspto.gov/assignments/q?db=tm&qt=sno&reel=&frame=&sno=73027311 |archive-date=7 May 2016 |url-status=live }}</ref><br />[[MD Helicopters|McDonnell Douglas Helicopters]] (1985–2002)<ref name=USPTO/><br />[[Alliant Techsystems]] (2002–2015)<ref name=USPTO/><br />[[Orbital Sciences Corporation|Orbital ATK]] (2015–2018)<ref name=USPTO/><br />[[Northrop Grumman Innovation Systems]] (2018–present)<ref name=USPTO/>
<!-- Production history -->
⚫
| unit_cost =
⚫
|designer = [[Hughes Helicopters]]<ref name=CGM>Chinn, George M., 1987, pp. 455–456.</ref><ref name=babel/>
⚫
| production_date = 1981–present
|design_date = 1976
|manufacturer = Hughes Helicopters (1981–1985)<ref name=CGM/><ref name=USPTO>{{cite web |url=http://assignments.uspto.gov/assignments/q?db=tm&qt=sno&reel=&frame=&sno=73027311 |title=Trademark Assignment Abstract of Title |publisher=[[United States Patent and Trademark Office]] |date=12 November 2018 |access-date=28 April 2019 |archive-url=https://web.archive.org/web/20160507001945/http://assignments.uspto.gov/assignments/q?db=tm&qt=sno&reel=&frame=&sno=73027311 |archive-date=7 May 2016 |url-status=live }}</ref><br />[[MD Helicopters|McDonnell Douglas Helicopters]] (1985–2002)<ref name=USPTO/><br />[[Alliant Techsystems]] (2002–2015)<ref name=USPTO/><br />[[Orbital Sciences Corporation|Orbital ATK]] (2015–2018)<ref name=USPTO/><br />[[Northrop Grumman Innovation Systems]] (2018–present)<ref name=USPTO/>
| number = >11,000<ref name=NGM242>{{cite web |url=http://www.northropgrumman.com/Capabilities/AutomaticWeapons/Documents/MK24225mmChainGunFactSheet.pdf |title=Northrop Grumman M242 25mm BUSHMASTER chain gun fact sheet |author=<!--Not stated--> |date=2018 |access-date=28 April 2019 |archive-url=https://web.archive.org/web/20190428194220/http://www.northropgrumman.com/Capabilities/AutomaticWeapons/Documents/MK24225mmChainGunFactSheet.pdf |archive-date=28 April 2019 |url-status=live }}</ref>
|unit_cost =
| variants = See ''[[#Variants|variants]]''
⚫
<!-- General specifications -->| spec_label =
⚫
|production_date = 1981–present
⚫
| weight = {{convert|119|kg|lk=on}}<ref name=NGM242/>
|number = >11,000<ref name=NGM242>{{cite web |url=http://www.northropgrumman.com/Capabilities/AutomaticWeapons/Documents/MK24225mmChainGunFactSheet.pdf |title=Northrop Grumman M242 25mm BUSHMASTER chain gun fact sheet |author=<!--Not stated--> |date=2018 |access-date=28 April 2019 |archive-url=https://web.archive.org/web/20190428194220/http://www.northropgrumman.com/Capabilities/AutomaticWeapons/Documents/MK24225mmChainGunFactSheet.pdf |archive-date=28 April 2019 |url-status=live }}</ref>
⚫
| length = {{convert|2672|mm|abbr=on}}<ref name=NGM242/>
|variants = See ''[[#Variants|variants]]''
⚫
| part_length = {{convert|2175|mm|abbr=on}}
⚫
<!-- General specifications -->
⚫
| width = {{convert|318|mm|abbr=on}}<ref name=NGM242/>
⚫
|spec_label =
|weight = {{convert|119|kg|lk=on}}<ref name=NGM242/>
| height = {{convert|373|mm|abbr=on}}<ref name=NGM242/>
⚫
| diameter =
⚫
|length = {{convert|2672|mm|abbr=on}}<ref name=NGM242/>
⚫
| crew = <!-- Ranged weapon specifications -->
⚫
|part_length = {{convert|2175|mm|abbr=on}}
|width = {{convert|318|mm|abbr=on}}<ref name=NGM242/>
| cartridge = 25 × 137 mm
| barrels = Single barrel (progressive RH parabolic twist)
⚫
|height = {{convert|373|mm|abbr=on}}<ref name=NGM242/>
| action = Externally powered, chain driven, [[open bolt]]
⚫
|diameter =
|crew =
| rate = Cyclic: 200 rpm with 1 hp or 500 rpm with 8 hp
⚫
| velocity = {{convert|1100|m/s|lk=on}}
⚫
<!-- Ranged weapon specifications -->
|cartridge = 25 × 137 mm
| range = {{convert|3000|m|lk=on}}
|caliber = [[25 mm caliber|{{convert|25|mm|2}} caliber]]
| max_range = {{convert|6800|m}}
|barrels = Single barrel (progressive RH parabolic twist)
| feed =
|action = Externally powered, chain driven, [[Open bolt]]
| sights =
|rate = • Cyclic: 200rpm with 1hp or 500rpm with 8hp
⚫
|velocity = {{convert|1100|m/s|lk=on}}
⚫
|range = {{convert|3000|m|lk=on}}
|max_range = {{convert|6800|m}}
|feed =
|sights =
}}
}}


The '''M242 Bushmaster chain gun''' is a [[25 mm caliber|25 mm (25×137mm)]] single-barrel [[chain gun|chain-driven]] [[autocannon]]. It is used extensively by the [[United States Armed Forces|U.S. military]], such as in the [[Bradley fighting vehicle]], as well as by other [[NATO]] members and some other nations in ground [[combat vehicle]]s and various watercraft. [[Hughes Helicopters]] in Culver City, California, was the original designer and manufacturer.<ref name=CGM/><ref name=babel/> [[MD Helicopters|McDonnell Douglas Helicopters]] acquired Hughes Helicopters in 1985, and merged into [[Boeing|Boeing Corporation]] in 1997. In 2002, it was sold again to [[Alliant Techsystems]], which merged with [[Orbital Sciences Corporation]] in 2015 to form Orbital Science ATK and was, in turn, bought out by [[Northrop Grumman]] in 2018.<ref name=USPTO/> {{As of|2019}}, [[Northrop Grumman Innovation Systems]] produces the gun.<ref name=NGM242/>
The '''M242 Bushmaster''' [[chain gun]] is a [[25 mm caliber|25 mm (25×137mm)]] single-barrel chain-driven [[autocannon]]. It is used extensively by the [[United States Armed Forces|U.S. military]], such as in the [[Bradley fighting vehicle]], as well as by other [[NATO]] members and some other nations in ground [[combat vehicle]]s and various watercraft. [[Hughes Helicopters]] in Culver City, California, was the original designer and manufacturer.<ref name=CGM/><ref name=babel/> {{As of|2019}}, [[Northrop Grumman Innovation Systems]] produces the gun.<ref name=NGM242/>


It is an externally powered, chain-driven, single-barrel weapon, that may be fired in semi-automatic, burst, or automatic modes. It is fed by a metallic link belt and has dual-feed capability. The term "chain gun" derives from the use of a [[roller chain]] that drives the bolt back and forth. The gun can destroy lightly armored vehicles and aerial targets (such as helicopters and slow-flying aircraft). It can also apply [[suppression fire]] against exposed troops, dug-in positions, and occupied built-up areas. The standard rate of fire is 200 [[cartridge (firearms)|rounds]] per minute. The weapon has an effective range of {{convert|3000|m|lk=on}}, depending on the type of ammunition used. With over 11,000 units sold worldwide, it is one of the most successful modern autocannons.<ref name=NGM242/>
It is an externally-powered, chain-driven, single-barrel weapon that may be fired in semi-automatic, burst, or automatic modes. It is fed by a metallic link belt and has dual-feed capability. The term ''chain gun'' derives from the use of a [[roller chain]] that drives the bolt back and forth. The gun can destroy lightly armored vehicles and aerial targets (such as helicopters and other slow-flying aircraft). It can also apply [[suppression fire]] against exposed troops, dug-in positions, and occupied built-up areas. The standard rate of fire is 200 [[cartridge (firearms)|rounds]] per minute. The weapon has an effective range of {{convert|2000|m|lk=on}},<ref>{{Cite web |title=M242 Bushmaster 25mm Automatic Gun |url=https://www.globalsecurity.org/military/systems/aircraft/systems/m242.htm |access-date=2023-06-06 |publisher=[[GlobalSecurity.org]] |language=en}}</ref> depending on the type of ammunition used. With over 11,000 units sold worldwide, it is one of the most successful modern autocannons.<ref name=NGM242/>


==Description==
==Description==
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The weapon assembly consists of three parts: the [[Barrel (firearms)|barrel]] assembly, the feeder assembly, and the receiver assembly. The three-part structure makes it possible for a two-person team to install or remove the system (under ideal conditions) despite its considerable total weight.
The weapon assembly consists of three parts: the [[Barrel (firearms)|barrel]] assembly, the feeder assembly, and the receiver assembly. The three-part structure makes it possible for a two-person team to install or remove the system (under ideal conditions) despite its considerable total weight.


The M242 weapon system has both electrical and manual fire control and can be operated electrically or manually. The gunner can choose from three rates of fire: (1) Single Shot Semi-Automatic, in which the gunner can shoot as fast as the trigger can be operated, limited only by the electrical drive speed (it cannot be fired faster than High rate); (2) Low Rate Fully Automatic, in which the weapon fires 100 rounds a minute, plus or minus 25 rounds; and (3) High Rate Fully Automatic, in which the weapon fires 200 rounds a minute, plus or minus 25 rounds.
The M242 weapon system has both electrical and manual fire control and can be operated electrically or manually. The gunner can choose from three rates of fire:
* ''Single shot semi-automatic'', in which the gunner can shoot as fast as the trigger can be operated, limited only by the electrical drive speed (it cannot exceed the "high rate" firing speed).
* ''Low rate fully automatic'', in which the weapon fires 100 rounds per minute, ± 25 rounds.
* ''High rate fully automatic'', in which the weapon fires 200 rounds per minute, ± 25 rounds.


==History==
==History==
[[File:M2Bradley-M242.jpg|thumb|The Enhanced M242 on the M2 Bradley (the top-mounted metal box and spotlight are [[Multiple Integrated Laser Engagement System|MILES]] training attachments, not part of the gun system). Note the [[Fluting (firearms)|fluted barrel]].]]
[[File:M2Bradley-M242.jpg|thumb|An enhanced M242 with a [[Fluting (firearms)|fluted barrel]] on an M2 Bradley (the top-mounted metal box and spotlight are [[Multiple Integrated Laser Engagement System|MILES]] training attachments, not part of the gun system).]]


The Bushmaster project started as an offshoot of the [[United States Army|US Army]]'s [[MICV-65]] program that was attempting to introduce a new [[infantry fighting vehicle]] to replace their existing [[M113 armored personnel carrier]]s. Part of this program called for a new scout vehicle to replace the [[M114 armored fighting vehicle|M114]], a parallel development taking place under the [[XM800 Armored Reconnaissance Scout Vehicle]]. Both the XM800 and the cavalry version of the XM701 MICV vehicles were armed with the '''M139''', a US-built version of the [[Hispano-Suiza HS.820]] 20&nbsp;mm autocannon. During the testing phase, the Army eventually rejected the XM701 and started work on a newer design known as the XM723. Soon after the XM800 was also rejected. This led to the combination of the two programs, moving the scout role to the cavalry version of the XM723.
The Bushmaster project started as an offshoot of the [[United States Army|US Army]]'s [[MICV-65]] program that was attempting to introduce a new [[infantry fighting vehicle]] to replace their existing [[M113 armored personnel carrier]]s. Part of this program called for a new scout vehicle to replace the [[M114 armored fighting vehicle|M114]], a parallel development taking place under the [[XM800 Armored Reconnaissance Scout Vehicle]]. Both the XM800 and the cavalry version of the XM701 MICV vehicles were armed with the ''M139'', a US-built version of the [[Hispano-Suiza HS.820]] 20&nbsp;mm autocannon. During the testing phase, the Army eventually rejected the XM701 and started work on a newer design known as the XM723. Soon after the XM800 was also rejected. This led to the combination of the two programs, moving the scout role to the cavalry version of the XM723.


At the same time, the M139 proved to be disappointing and a contract for a new weapon to replace it started as a competitive development in 1972 simultaneously at [[Ford Motor Company|Ford]] [[Aeronutronic]] Division with the [[Oerlikon KBA|PFB-25]] (self-powered weapon) and [[Hughes Helicopters]] Ordnance Division (externally-powered,)<ref name=babel>[https://babel.hathitrust.org/cgi/pt?id=mdp.39015074749436;view=1up;seq=192 Fiscal Year 1977 Authorization for Military Procurement, pt. 6.], p. 3242.</ref> under the [[Summa Corporation]] as the '''Vehicle Rapid-Fire Weapons System-Successor''', or '''VRFWS-S'''. This was essentially a power-driven gun firing similar 20mm ammunition as the HS.820, the power-driven mechanism would ensure operation even in the case of a misfire.
At the same time, the M139 proved to be disappointing and a contract for a new weapon to replace it started as a competitive development in 1972 simultaneously at [[Ford Motor Company|Ford]]'s [[Aeronutronic]] Division with the [[Oerlikon KBA|PFB-25]] (self-powered weapon) and the [[Hughes Helicopters]]' Ordnance Division (externally-powered,)<ref name=babel>[https://babel.hathitrust.org/cgi/pt?id=mdp.39015074749436;view=1up;seq=192 Fiscal Year 1977 Authorization for Military Procurement, pt. 6.], p. 3242.</ref> under the [[Summa Corporation]] as the ''Vehicle Rapid-Fire Weapons System-Successor'', or ''VRFWS-S''. This was essentially a power-driven gun firing similar 20 mm ammunition to the HS.820, the power-driven mechanism was to ensure operation even in the case of a misfire.


Progress on the VRFWS-S was slow, and eventually resulted in a switch to a much more powerful 25&nbsp;mm round. Similar delays in the MICV program meant the ultimate vehicles descending from their efforts, the M2/M3 Bradley Fighting Vehicle, did not enter production until 1981, by which point the Bushmaster had matured. Since 1990, there have been several enhancements made upon the weapon, resulting in the [[#Enhanced 25 mm gun|Enhanced 25 mm gun]].
Progress on the VRFWS-S was slow, and eventually resulted in a switch to a much more powerful, 25&nbsp;mm, round. Similar delays in the MICV program meant the ultimate vehicles descending from their efforts, the M2/M3 Bradley fighting vehicle, did not enter production until 1981, by which point the Bushmaster had matured. Since 1990, there have been several enhancements made upon the weapon, resulting in the [[#Enhanced 25 mm gun|enhanced 25 mm gun]].


To date, more than 10,500 weapons are in service. One of the major reasons for this popularity is the extremely reliable nature of the weapon. It has a rating of 22,000 mean rounds between failure (MRBF), much higher than many comparable devices.
To date, more than 10,500 weapons are in service. One of the major reasons for this popularity is the extremely reliable nature of the weapon. It has a rating of 22,000 mean rounds between failure (MRBF), much higher than many comparable devices.
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==Ammunition==
==Ammunition==
[[File:US 25mm Caliber Ammunition -a.jpg | thumb]]
[[File:US 25mm Caliber Ammunition -a.jpg | thumb]]
[[File:US Navy 090129-N-4774B-008 Gunner's Mate 2nd Class Nicholas Brassard inspects rounds for the MK-38 25mm machine gun system.jpg|thumb|M793 Target Practice with Tracer (TP-T) rounds for the MK-38 being inspected.]]
[[File:US Navy 090129-N-4774B-008 Gunner's Mate 2nd Class Nicholas Brassard inspects rounds for the MK-38 25mm machine gun system.jpg|thumb|M793 target practice with tracer (TP-T) rounds for the MK-38 being inspected]]
[[File:US Navy 090529-N-5345W-126 Gunner's Mate 2nd Class Michael Miller downloads an ammo belt from an MK 38 25mm gun.jpg|thumb|right|MK210 High Explosive Incendiary with Tracer (HEI-T)]]
[[File:US Navy 090529-N-5345W-126 Gunner's Mate 2nd Class Michael Miller downloads an ammo belt from an MK 38 25mm gun.jpg|thumb|right|MK210 high explosive incendiary with tracer (HEI-T)]]


A wide range of ammunition has been developed for this weapon, providing it with the capability to defeat the majority of [[Armored fighting vehicle|armored vehicles]] it is likely to encounter, up to and including some [[light tank]]s. The ammunition used in the M242 may also be used in a variety of weapons such as the [[GAU-12 Equalizer]], the French [[Giat M811]], or the Swiss [[Oerlikon KBA]] weapon system. It has the capability to fire U.S. manufactured ammunition as well as the [[NATO]] equivalents thereof. Primarily though, it fires six types of rounds: the M791, M792, M793, M910, MK210, and M919.
A wide range of ammunition has been developed for this weapon, providing it with the capability to defeat the majority of [[Armored fighting vehicle|armored vehicles]] it is likely to encounter, up to and including some [[light tank]]s, including an encounter during the war in Ukraine where a Russian T-90M main battle tank was forced to be abandoned. The ammunition used in the M242 may also be used in a variety of weapons such as the [[GAU-12 Equalizer]], the French [[Giat M811]], or the Swiss [[Oerlikon KBA]] weapon system. It has the capability to fire U.S. manufactured ammunition as well as the [[NATO]] equivalents thereof. Primarily though, it fires six types of rounds: the M791, M792, M793, M910, MK210, and M919.
;M791 [[Armor-piercing discarding sabot]] with Tracer
;M791 [[armor-piercing discarding sabot]] with [[Tracer ammunition|tracer]]
: The APDS-T penetrates lightly [[Armored fighting vehicle|armored vehicles]], [[self-propelled artillery]], and aerial targets such as helicopters and various slow-moving, fixed-wing aircraft.
: The APDS-T penetrates lightly [[Armored fighting vehicle|armored vehicles]], [[self-propelled artillery]], and aerial targets such as helicopters and various slow-moving, fixed-wing aircraft.
;M792 High Explosive Incendiary with Tracer and Self Destruct
;M792 high explosive incendiary with tracer and self destruct
:The HEI-T can destroy unarmored vehicles and helicopters and suppress [[Anti-tank guided missile|anti-tank missile]] positions and enemy squads out to a maximum effective range of 2,200 meters.
:The HEI-T can destroy unarmored vehicles and helicopters and suppress [[Anti-tank guided missile|anti-tank missile]] positions and enemy squads out to a maximum effective range of 2,200 meters.
;M793 Target Practice with [[Tracer ammunition|Tracer]]
;M793 target practice with tracer
:The TP-T cartridge is a fixed-type, percussion-primed training round that matches the High Explosive Incendiary with Tracer (HEI-T M792) round ballistically. The TP-T's tracer is visible out to 2,000 meters, however, the round has a maximum effective range (accuracy-limited) of 1,600 meters.
:The TP-T cartridge is a fixed-type, percussion-primed training round that matches the high explosive incendiary with tracer (HEI-T M792) round ballistically. The TP-T's tracer is visible out to 2,000 meters, however, the round has a maximum effective range (accuracy-limited) of 1,600 meters.
;M910 Target Practice Discarding Sabot with Tracer
;M910 target practice discarding sabot with tracer
:The TPDS-T replicates the flight pattern of the M791 Armor Piercing Discarding [[Sabot (firearms)|Sabot]] with Tracer (APDS-T) round. The TPDS-T allows units to realistically practice sabot engagements.
:The TPDS-T replicates the flight pattern of the M791 armor piercing discarding [[Sabot (firearms)|sabot]] with tracer (APDS-T) round. The TPDS-T allows units to realistically practice sabot engagements.
;MK210 High Explosive Incendiary with Tracer
;MK210 high explosive incendiary with tracer
:Used by the U. S. Navy in their Mk38 naval weapon system.
:Used by the U. S. Navy in their Mk38 naval weapon system.
;M919 Armor-Piercing, Fin-Stabilized Discarding Sabot With Tracer.
;M919 armor-piercing, fin-stabilized discarding sabot with tracer.
:The [[Armour-piercing fin-stabilized discarding sabot|APFSDS]]-T round penetrates light armored vehicles, self-propelled artillery, and aerial targets, which includes helicopters and slow-moving [[fixed-wing aircraft]]. The dart is made of [[depleted uranium]].
:The [[Armour-piercing fin-stabilized discarding sabot|APFSDS]]-T round penetrates lightly armored vehicles, self-propelled artillery, and aerial targets, which include helicopters and slow-moving [[fixed-wing aircraft]]. The dart is made of [[depleted uranium]].


==Variants==
==Variants==
The M242 is currently in use by the United States [[United States Army|Army]], [[United States Navy|Navy]], [[United States Marine Corps|Marine Corps]], and [[United States Coast Guard|Coast Guard]], the [[New Zealand Army]], [[Royal New Zealand Navy]], the [[Norwegian Army]], the [[Spanish Army]], the [[Sri Lanka Navy]], the [[Military of Switzerland|Swiss Army]], the [[Canadian Forces|Canadian Army]], the [[Australian Army]] and the [[Royal Australian Navy]], the [[Israeli Navy]], [[Philippine Navy]] and [[Philippine Army]], the [[Singapore Army]] and [[Republic of Singapore Navy]] as well as several others. The wide usage results in several variations and modifications on the standard M242 weapon system.
The M242 is currently in use by the [[United States Army]], the [[United States Navy]], the [[United States Marine Corps]], the [[United States Coast Guard]], the [[New Zealand Army]], the [[Royal New Zealand Navy]], the [[Norwegian Army]], the [[Spanish Army]], the [[Sri Lanka Navy]], the [[Military of Switzerland|Swiss Army]], the [[Canadian Army]], the [[Royal Canadian Navy]], the [[Australian Army]], the [[Royal Australian Navy]], the [[Israeli Navy]], the [[Philippine Navy]], the [[Philippine Army]], the [[Singapore Army]], and the [[Republic of Singapore Navy]] as well as several others, including since 2023 the [[Armed Forces of Ukraine]].<ref name="tafu">{{cite news |url=https://www.telegraph.co.uk/news/2024/01/18/ukraine-bradley-fighting-vehicles-disabled-russian-tank/ |title=Watch: Russia's most advanced tank destroyed by US Bradley fighting vehicle |newspaper=The Telegraph |date=18 January 2024 |last1=Barnes |first1=Joe }}</ref> The wide usage has resulted in several variations and modifications on the standard M242 weapon system.


===Ground vehicles===
===Ground vehicles===
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The M242 is standard equipment on the U. S. Army M2 and M3 Bradley fighting vehicles; it is also in use on the [[LAV-25]]. Before the project was cancelled, the [[Mk44 Bushmaster II|Mk44 Bushmaster II 30 mm chain gun]] (a successor to the M242) was used on the Marine Corps' [[Expeditionary Fighting Vehicle]] (EFV).
The M242 is standard equipment on the U. S. Army M2 and M3 Bradley fighting vehicles; it is also in use on the [[LAV-25]]. Before the project was cancelled, the [[Mk44 Bushmaster II|Mk44 Bushmaster II 30 mm chain gun]] (a successor to the M242) was used on the Marine Corps' [[Expeditionary Fighting Vehicle]] (EFV).


The M242 is also a popular choice of primary armament for [[armoured fighting vehicle]]s manufactured around the world, such as [[Singapore]]'s [[Bionix AFV]]s and as the [[Rafael Overhead Weapon Station|Rafael Overhead Weapon Station-25]] mounted on upgraded [[Variants of the M113 armored personnel carrier#Singapore|M113A2 Ultra IFV]]s.<ref name="SAF">{{cite press release|title=Factsheet – Technical Specifications of Ultra M113|publisher=[[Ministry of Defence, Singapore]]|date=16 June 1998|quote=[Last updated on 12 June 2010]|url=http://www.mindef.gov.sg/imindef/news_and_events/nr/1998/jun/16jun98_nr2/16jun98_fs.html|access-date=28 October 2010|archive-url=https://web.archive.org/web/20171025073802/https://www.mindef.gov.sg/imindef/news_and_events/nr/1998/jun/16jun98_nr2/16jun98_fs.html|archive-date=25 October 2017|url-status=live}}</ref>
The M242 is also a popular choice of primary armament for [[armored fighting vehicle]]s manufactured around the world, such as Singapore's [[Bionix AFV]]s and as the [[Rafael Overhead Weapon Station|Rafael Overhead Weapon Station-25]] mounted on upgraded [[Variants of the M113 armored personnel carrier#Singapore|M113A2 Ultra IFV]]s.<ref name="SAF">{{cite press release|title=Factsheet – Technical Specifications of Ultra M113|publisher=[[Ministry of Defence, Singapore]]|date=16 June 1998|quote=[Last updated on 12 June 2010]|url=http://www.mindef.gov.sg/imindef/news_and_events/nr/1998/jun/16jun98_nr2/16jun98_fs.html|access-date=28 October 2010|archive-url=https://web.archive.org/web/20171025073802/https://www.mindef.gov.sg/imindef/news_and_events/nr/1998/jun/16jun98_nr2/16jun98_fs.html|archive-date=25 October 2017|url-status=live}}</ref>


===Enhanced 25 mm gun===
===Enhanced 25 mm gun===
Work on an upgraded weapon began in 1990. In the upgrade program, all three major systems and seven minor systems were improved. The modifications began with introducing a [[Chrome plating|chrome-lined]] barrel, an enhanced feeder, and an enhanced receiver. The weapon systems also received minor upgrades such as quick-detachable link covers, a larger breech assembly, a high efficiency [[muzzle brake]], longer [[recoil]], an integral round counter, an extended life [[Pin#Firearms|firing pin]] and spring, and a triple-spring drive clutch. Upgraded weapons were first put to use on the M2A3 Bradley, the fourth version of the M2 Bradley Fighting Vehicle.
Work on an upgraded weapon began in 1990. In the upgrade program, all three major systems and seven minor systems were improved. The modifications began with introducing a [[Chrome plating|chrome-lined]] barrel, an enhanced feeder, and an enhanced receiver. The weapon systems also received minor upgrades such as quick-detachable link covers, a larger breech assembly, a high efficiency [[muzzle brake]], longer [[recoil]], an integral round counter, an extended life [[Pin#Firearms|firing pin]] and spring, and a triple-spring drive clutch. Upgraded weapons were first put to use on the M2A3 Bradley, the fourth version of the M2 Bradley fighting vehicle.


===Naval===
===Naval===
<!-- This section is linked from [[USS Peleliu (LHA-5)]] -->
<!-- This section is linked from [[USS Peleliu (LHA-5)]] -->
{{Main|Mark 38 25 mm Machine Gun System|l1 = Mark 38 25 mm Machine Gun System}}
{{Main|Mark 38 25 mm Machine Gun System|l1 = Mark 38 25 mm Machine Gun System}}
In 1977, the [[U. S. Navy]] realized that it needed a replacement for the [[Oerlikon 20 mm cannon|Oerlikon 20mm Mk 16 series of guns]]. In 1986, this requirement was satisfied with the introduction of the '''Mk 38 Mod 0''' weapons system. A derivative of the M242 system, the Mk 38 consists of the M242 chain gun and the '''Mk 88 Mod 0''' machine gun mount. It provides ships with defensive and offensive gunfire capability for the engagement of a variety of surface targets. Designed primarily as a close-range defensive measure, it provides protection against [[patrol boat]]s, [[Naval mine|floating mines]], and various shore-based targets.
In 1977, the [[U. S. Navy]] realized that it needed a replacement for the [[Oerlikon 20 mm cannon|Oerlikon 20 mm Mk 16 series of guns]]. In 1986, this requirement was satisfied with the introduction of the ''Mk 38 Mod 0'' weapons system. A derivative of the M242 system, the Mk 38 consists of the M242 chain gun and the ''Mk 88 Mod 0'' machine gun mount. It provides ships with defensive and offensive gunfire capability for the engagement of a variety of surface targets. Designed primarily as a close-range defensive measure, it provides protection against [[patrol boat]]s, [[Naval mine|floating mines]], and various shore-based targets.
====Mk 38 Mod 2 and Mod 3====
====Mk 38 Mod 2 and Mod 3====
{{See also|Typhoon Weapon System}}
{{See also|Typhoon Weapon System}}


Recently, several US Navy platforms have been outfitted with a newer version, the [[Typhoon Weapon System]] designated '''Mk 38 Mod 2''',<ref name="BAE">{{cite web|url=http://www.baesystems.com/ProductsServices/mk38_mod2_stabilized_minor_gun.html|title=Mk 38 Mod 2 Machine Gun System (MGS)|publisher=BAE Systems|access-date=24 October 2010|archive-url=https://web.archive.org/web/20090308111303/http://www.baesystems.com/ProductsServices/mk38_mod2_stabilized_minor_gun.html|archive-date=8 March 2009|url-status=dead}}</ref><ref>{{Cite web |url=http://www.rafael.co.il/marketing/SIP_STORAGE/FILES/1/941.pdf |title=Archived copy |access-date=26 August 2010 |archive-url=https://web.archive.org/web/20121202130720/http://www.rafael.co.il/marketing/SIP_STORAGE/FILES/1/941.pdf |archive-date=2 December 2012 |url-status=dead }}</ref> which is remotely operated and includes an Electronic Optical Sight, Laser Range-Finder, FLIR, and a more reliable feeding system, enhancing the weapon system's capabilities and accuracy. In 2006 the [[Sri Lanka Navy]] added the M242 to its fleet of [[Ultra Fast Attack Craft|fast attack craft]].<ref name="JNI">[http://www.navy.lk/index.php?id=1198 Sri-Lanka learns to counter Sea Tigers’ swarm tactics, JANE’S NAVY INTERNATIONAL] {{webarchive|url=https://web.archive.org/web/20111103051541/http://www.navy.lk/index.php?id=1198 |date=3 November 2011 }}, [[Jane's Information Group]].</ref>
Recently, several US Navy platforms have been outfitted with a newer version, the [[Typhoon Weapon System]] designated ''Mk 38 Mod 2'',<ref name="BAE">{{cite web|url=http://www.baesystems.com/ProductsServices/mk38_mod2_stabilized_minor_gun.html|title=Mk 38 Mod 2 Machine Gun System (MGS)|publisher=BAE Systems|access-date=24 October 2010|archive-url=https://web.archive.org/web/20090308111303/http://www.baesystems.com/ProductsServices/mk38_mod2_stabilized_minor_gun.html|archive-date=8 March 2009|url-status=dead}}</ref><ref>{{Cite web |url=http://www.rafael.co.il/marketing/SIP_STORAGE/FILES/1/941.pdf |title=Typhoon: Naval Stabilized & Remotely Operated Gun System |access-date=26 August 2010 |archive-url=https://web.archive.org/web/20121202130720/http://www.rafael.co.il/marketing/SIP_STORAGE/FILES/1/941.pdf |archive-date=2 December 2012 |url-status=dead }}</ref> which is remotely operated and includes an electronic optical sight, laser range-finder, FLIR, and a more reliable feeding system, enhancing the weapon system's capabilities and accuracy. In 2006 the [[Sri Lanka Navy]] added the M242 to its fleet of [[Ultra Fast Attack Craft|fast attack craft]].<ref name="JNI">[http://www.navy.lk/index.php?id=1198 Sri-Lanka learns to counter Sea Tigers’ swarm tactics, JANE’S NAVY INTERNATIONAL] {{webarchive|url=https://web.archive.org/web/20111103051541/http://www.navy.lk/index.php?id=1198 |date=3 November 2011 }}, [[Jane's Information Group]].</ref>


The system is also in use by the [[Republic of Singapore Navy]]'s {{sclass|Formidable|frigate}}s and {{sclass|Endurance|landing platform dock ship}}s<ref name="RSN">{{cite web|url=http://www.mindef.gov.sg/imindef/mindef_websites/atozlistings/navy/assets/weapons.html|title=RSN – Assets – Weapons|date=23 July 2010|publisher=[[Ministry of Defence (Singapore)]] (MINDEF)|access-date=15 September 2010|archive-url=https://web.archive.org/web/20080720080143/http://www.mindef.gov.sg/imindef/mindef_websites/atozlistings/navy/assets/weapons.html|archive-date=20 July 2008|url-status=live}}</ref> and were deployed as part of coalition forces' port security efforts in [[Iraq]] as well as anti-piracy roles in the [[Gulf of Aden]].<ref name="RSN2">{{Cite web|url=http://www.mindef.gov.sg/imindef/publications/cyberpioneer/3g_saf/2005/features/may05_cs.html|title=The Next Wave|date=6 May 2010|publisher=MINDEF|access-date=15 September 2010|archive-url=https://web.archive.org/web/20171014234432/https://www.mindef.gov.sg/imindef/publications/cyberpioneer/3g_saf/2005/features/may05_cs.html|archive-date=14 October 2017|url-status=live}}</ref> Aside from that, the [[Police Coast Guard|Singapore Police Coast Guard]]'s New Coastal Patrol Craft (NCPC) has adopted the system as its main armament.<ref name="PCG">{{cite journal|last=Muhammad Juffry|first=Bin Joihani|date=Jul–Aug 2009|title=PCG upgrades with new fleet and training centre|journal=Police Life Monthly|publisher=[[Singapore Police Force]]|location=Singapore|volume=35|issue=7|issn=0217-8699|url=http://www.spf.gov.sg/prints/plm/2009/julaug_pg02.htm|access-date=8 November 2010|archive-url=https://web.archive.org/web/20110622002441/http://www.spf.gov.sg/prints/plm/2009/julaug_pg02.htm|archive-date=22 June 2011|url-status=dead}}</ref>
The system is also in use by the [[Republic of Singapore Navy]]'s {{sclass|Formidable|frigate}}s and {{sclass|Endurance|landing platform dock ship}}s<ref name="RSN">{{cite web|url=http://www.mindef.gov.sg/imindef/mindef_websites/atozlistings/navy/assets/weapons.html|title=RSN – Assets – Weapons|date=23 July 2010|publisher=[[Ministry of Defence (Singapore)]] (MINDEF)|access-date=15 September 2010|archive-url=https://web.archive.org/web/20080720080143/http://www.mindef.gov.sg/imindef/mindef_websites/atozlistings/navy/assets/weapons.html|archive-date=20 July 2008|url-status=live}}</ref> and were deployed as part of coalition forces' port security efforts in Iraq as well as anti-piracy roles in the [[Gulf of Aden]].<ref name="RSN2">{{Cite web|url=http://www.mindef.gov.sg/imindef/publications/cyberpioneer/3g_saf/2005/features/may05_cs.html|title=The Next Wave|date=6 May 2010|publisher=MINDEF|access-date=15 September 2010|archive-url=https://web.archive.org/web/20171014234432/https://www.mindef.gov.sg/imindef/publications/cyberpioneer/3g_saf/2005/features/may05_cs.html|archive-date=14 October 2017|url-status=live}}</ref> Aside from that, the [[Police Coast Guard|Singapore Police Coast Guard]]'s new coastal patrol craft (NCPC) has adopted the system as its main armament.<ref name="PCG">{{cite journal|last=Muhammad Juffry|first=Bin Joihani|date=Jul–Aug 2009|title=PCG upgrades with new fleet and training centre|journal=Police Life Monthly|publisher=[[Singapore Police Force]]|location=Singapore|volume=35|issue=7|issn=0217-8699|url=http://www.spf.gov.sg/prints/plm/2009/julaug_pg02.htm|access-date=8 November 2010|archive-url=https://web.archive.org/web/20110622002441/http://www.spf.gov.sg/prints/plm/2009/julaug_pg02.htm|archive-date=22 June 2011|url-status=dead}}</ref>


The Mod 3 updates electronics and adds a coaxial 7.62mm machine gun with a 570-round-per-minute rate of fire.<ref>{{cite web |title=MK 38 – 25 mm Machine Gun System |url=https://www.navy.mil/navydata/fact_display.asp?cid=2100&tid=500&ct=2 |website=United States Navy Fact File |access-date=6 April 2019 |archive-url=https://web.archive.org/web/20181103001136/https://www.navy.mil/navydata/fact_display.asp?cid=2100&tid=500&ct=2 |archive-date=3 November 2018 |url-status=live }}</ref><ref>{{cite web |title=Mk 38 Mod 3 Machine Gun System (MGS) |url=https://www.baesystems.com/en-us/product/mk-38-machine-gun-system |publisher=BAE Systems. |access-date=6 April 2019 |archive-url=https://web.archive.org/web/20190406014540/https://www.baesystems.com/en-us/product/mk-38-machine-gun-system |archive-date=6 April 2019 |url-status=live }}</ref><ref>{{cite web |title=Contracts for June 29, 2018 |url=https://dod.defense.gov/News/Contracts/Contract-View/Article/1564122/ |publisher=U.S. Department of Defense Search Defense.gov: Search |access-date=6 April 2019 |archive-url=https://web.archive.org/web/20190406014537/https://dod.defense.gov/News/Contracts/Contract-View/Article/1564122/ |archive-date=6 April 2019 |url-status=live }}</ref>
The Mod 3 updates electronics and adds a coaxial 7.62 mm machine gun with a 570-round-per-minute rate of fire.<ref>{{cite web |title=MK 38 – 25 mm Machine Gun System |url=https://www.navy.mil/navydata/fact_display.asp?cid=2100&tid=500&ct=2 |website=United States Navy Fact File |access-date=6 April 2019 |archive-url=https://web.archive.org/web/20181103001136/https://www.navy.mil/navydata/fact_display.asp?cid=2100&tid=500&ct=2 |archive-date=3 November 2018 |url-status=live }}</ref><ref>{{cite web |title=Mk 38 Mod 3 Machine Gun System (MGS) |url=https://www.baesystems.com/en-us/product/mk-38-machine-gun-system |publisher=BAE Systems. |access-date=6 April 2019 |archive-url=https://web.archive.org/web/20190406014540/https://www.baesystems.com/en-us/product/mk-38-machine-gun-system |archive-date=6 April 2019 |url-status=live }}</ref><ref>{{cite web |title=Contracts for June 29, 2018 |url=https://dod.defense.gov/News/Contracts/Contract-View/Article/1564122/ |publisher=U.S. Department of Defense Search Defense.gov: Search |access-date=6 April 2019 |archive-url=https://web.archive.org/web/20190406014537/https://dod.defense.gov/News/Contracts/Contract-View/Article/1564122/ |archive-date=6 April 2019 |url-status=live }}</ref>


====Aselsan STOP====
====Aselsan STOP====
{{See also|Aselsan STOP}}
{{See also|Aselsan STOP}}
Turkish made [[Aselsan STOP]] stabilized [[Remote controlled weapon station|weapon station]] can be fitted with a M242 Bushmaster.<ref>{{cite web |url= https://www.aselsan.com.tr/en/capabilities/land-and-weapon-systems/remote-controlled-weapon-system-naval/25-mm-stop-remote-controlled-stabilized-naval-gun-system|title = 25 mm STOP Remote Controlled Stabilized Naval Gun System
Turkish made [[Aselsan STOP]] stabilized [[Remote controlled weapon station|weapon station]] can be fitted with an M242 Bushmaster.<ref>{{cite web |url= https://www.aselsan.com.tr/en/capabilities/land-and-weapon-systems/remote-controlled-weapon-system-naval/25-mm-stop-remote-controlled-stabilized-naval-gun-system|title = 25 mm STOP Remote Controlled Stabilized Naval Gun System
|publisher= Aselsan |accessdate= 8 July 2021}}</ref>
|publisher= Aselsan |accessdate= 8 July 2021}}</ref>


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File:Bushmaster Gun Weapon Station.jpg|Weapons station for the remote controlled M242 on the multi-role vessel {{HMNZS|Canterbury|L421|6}}
File:Bushmaster Gun Weapon Station.jpg|Weapons station for the remote controlled M242 on the multi-role vessel {{HMNZS|Canterbury|L421|6}}
File:US Navy 031215-N-3236B-003 Marines assigned to the 13th Marine Expeditionary Unit (13th MEU) 1st Light Armor Reconnaissance Battalion Landing Team (1st LAR BLT 1-1) perform maintenance on Light Armored Vehicles.jpg|The United States Marine Corps' LAV-25.
File:US Navy 031215-N-3236B-003 Marines assigned to the 13th Marine Expeditionary Unit (13th MEU) 1st Light Armor Reconnaissance Battalion Landing Team (1st LAR BLT 1-1) perform maintenance on Light Armored Vehicles.jpg|The United States Marine Corps' LAV-25.
File:Mk 38 25mm Machine Gun System.jpg|The Mk38. The M242 has a characteristic [[Fluting (firearms)|fluted gun barrel]] to reduce weight and assist cooling.<ref>{{cite web|author1=Joel Avila,1LT(P) EN, USAR|title=The Real Benefits of Barrel Fluting|url=http://www.snipercountry.com/articles/realbenefitsbarrelfluting.asp|website=www.snipercountry.com|access-date=25 August 2014|archive-url=https://web.archive.org/web/20141024112548/http://www.snipercountry.com/Articles/RealBenefitsBarrelFluting.asp|archive-date=24 October 2014|url-status=dead}}</ref>
File:Mk 38 25mm Machine Gun System.jpg|An Mk38. The M242 has a characteristic [[Fluting (firearms)|fluted gun barrel]] to reduce weight and assist cooling.<ref>{{cite web|author1=Joel Avila |title=The Real Benefits of Barrel Fluting|url=http://www.snipercountry.com/articles/realbenefitsbarrelfluting.asp|website=www.snipercountry.com|access-date=25 August 2014|archive-url=https://web.archive.org/web/20141024112548/http://www.snipercountry.com/Articles/RealBenefitsBarrelFluting.asp|archive-date=24 October 2014|url-status=dead}}</ref>
File:US Navy 111231-N-KS651-967 A Mk 38 MOD 2 25mm machine gun system aboard the amphibious dock landing ship USS Pearl Harbor (LSD 52) ejects casings d.jpg|Mk 38 MOD 2 25mm autocannon gun system aboard the amphibious dock landing ship {{USS|Pearl Harbor}} forward ejecting the spent casings.
File:US Navy 111231-N-KS651-967 A Mk 38 MOD 2 25mm machine gun system aboard the amphibious dock landing ship USS Pearl Harbor (LSD 52) ejects casings d.jpg|A Mk 38 MOD 2 25 mm autocannon gun system aboard the amphibious dock landing ship {{USS|Pearl Harbor}} forward ejecting the spent casings.
</gallery>
</gallery>


BAE and Boeing teamed together after a March 2011 contract to add a [[directed energy weapon]] to the Mk 38 Mod 2 gun mount, known as the '''Mk 38 Mod 2 tactical laser system'''. The TLS combines a Boeing-designed solid-state laser with the existing BAE-manufactured Mk 38 mount to deliver high-precision accuracy against fast surface and air threats including speed boats and [[unmanned aerial vehicle]]s (UAVs). Laser power levels can be adjusted depending on the target and mission objectives.<ref>[http://defensetech.org/2011/07/25/bae-putting-lasers-on-mk-38-naval-gun/ BAE Putting Lasers on Mk 38 Naval Gun] {{Webarchive|url=https://web.archive.org/web/20141112190948/http://defensetech.org/2011/07/25/bae-putting-lasers-on-mk-38-naval-gun/ |date=12 November 2014 }} – Defensetech.org, 25 July 2011</ref><ref>[http://www.gizmag.com/mk-38-mod-2-tactical-laser-system/19346/ Boeing and BAE team up to develop laser weapon for the U.S. Navy] {{Webarchive|url=https://web.archive.org/web/20141102225422/http://www.gizmag.com/mk-38-mod-2-tactical-laser-system/19346/ |date=2 November 2014 }} – Gizmag.com, 26 July 2011</ref> Originally, the system was armed with a 10&nbsp;kW laser, but in April 2017 BAE announced they had increased power to 60&nbsp;kW.<ref>[http://navyrecognition.com/index.php/news/naval-exhibitions/2017/sea-air-space-2017-show-daily-news/5054-sas-2017-bae-systems-unveils-a-60-kw-variant-of-the-mk-38-tactical-laser-system.html BAE Systems Unveils a 60 kW Variant of the MK 38 Tactical Laser System] {{Webarchive|url=https://web.archive.org/web/20170406021925/http://navyrecognition.com/index.php/news/naval-exhibitions/2017/sea-air-space-2017-show-daily-news/5054-sas-2017-bae-systems-unveils-a-60-kw-variant-of-the-mk-38-tactical-laser-system.html |date=6 April 2017 }} – Navyrecognition.com, 4 April 2017</ref>
BAE and Boeing teamed together after a March 2011 contract to add a [[directed energy weapon]] to the Mk 38 Mod 2 gun mount, known as the ''Mk 38 Mod 2 tactical laser system''. The TLS combines a Boeing-designed solid-state laser with the existing BAE-manufactured Mk 38 mount to deliver high-precision accuracy against fast surface and air threats including speed boats and [[unmanned aerial vehicle]]s (UAVs). Laser power levels can be adjusted depending on the target and mission objectives.<ref>[http://defensetech.org/2011/07/25/bae-putting-lasers-on-mk-38-naval-gun/ BAE Putting Lasers on Mk 38 Naval Gun] {{Webarchive|url=https://web.archive.org/web/20141112190948/http://defensetech.org/2011/07/25/bae-putting-lasers-on-mk-38-naval-gun/ |date=12 November 2014 }} – Defensetech.org, 25 July 2011</ref><ref>[http://www.gizmag.com/mk-38-mod-2-tactical-laser-system/19346/ Boeing and BAE team up to develop laser weapon for the U.S. Navy] {{Webarchive|url=https://web.archive.org/web/20141102225422/http://www.gizmag.com/mk-38-mod-2-tactical-laser-system/19346/ |date=2 November 2014 }} – Gizmag.com, 26 July 2011</ref> Originally, the system was armed with a 10&nbsp;kW laser, but in April 2017 BAE announced they had increased power to 60&nbsp;kW.<ref>[http://navyrecognition.com/index.php/news/naval-exhibitions/2017/sea-air-space-2017-show-daily-news/5054-sas-2017-bae-systems-unveils-a-60-kw-variant-of-the-mk-38-tactical-laser-system.html BAE Systems Unveils a 60 kW Variant of the MK 38 Tactical Laser System] {{Webarchive|url=https://web.archive.org/web/20170406021925/http://navyrecognition.com/index.php/news/naval-exhibitions/2017/sea-air-space-2017-show-daily-news/5054-sas-2017-bae-systems-unveils-a-60-kw-variant-of-the-mk-38-tactical-laser-system.html |date=6 April 2017 }} – Navyrecognition.com, 4 April 2017</ref>


====Proposed upgrades====
====Proposed upgrades====
In April 2012, BAE unveiled a potential version of the system mount, developed in collaboration with [[Rafael Advanced Defense Systems]]. It is visually distinctive from previous versions with its stealthy housing, which also protects the gun from weather and allows for easier access to internal components through large access panels. The upgrade mounts a larger [[Alliant Techsystems]] [[Mk44 Bushmaster II]] 30&nbsp;mm cannon for a 500-meter range increase, as well as a coaxial .50 caliber [[M2 machine gun|M2 heavy machine gun]]. Elevation is increased to +75 degrees for engaging UAVs and helicopters, and ammunition storage is greater at 420 30&nbsp;mm rounds. Other features include a larger manual fire control panel, an offset mode specifically for firing warning shots, and a surveillance mode where the gun can be pointed away from a target but the EO sensor remains pointed in the target direction. Although it has a high degree of commonality and has the same footprint as previous models, the upgrade is 20 percent heavier due to greater ammo load.<ref>[http://www.defensemedianetwork.com/stories/bae-systems-developing-next-generation-mk-38-gun-mount/ BAE Systems Developing Next Generation Mk 38 Gun Mount] {{Webarchive|url=https://web.archive.org/web/20150403112109/http://www.defensemedianetwork.com/stories/bae-systems-developing-next-generation-mk-38-gun-mount/ |date=3 April 2015 }} – Defensemedianetwork.com, 24 September 2012</ref>
In April 2012, BAE unveiled a potential version of the system mount, developed in collaboration with [[Rafael Advanced Defense Systems]]. It is visually distinctive from previous versions with its stealthy housing, which also protects the gun from weather and allows for easier access to internal components through large access panels. The upgrade mounts a larger [[Alliant Techsystems]] [[Mk44 Bushmaster II]] 30&nbsp;mm cannon for a 500-meter range increase, as well as a coaxial .50 caliber [[M2 machine gun|M2 heavy machine gun]]. Elevation is increased to +75 degrees for engaging UAVs and helicopters, and ammunition storage is greater at 420 30&nbsp;mm rounds. Other features include a larger manual fire control panel, an offset mode specifically for firing warning shots, and a surveillance mode where the gun can be pointed away from a target but the EO sensor remains pointed in the target direction. Although it has a high degree of commonality and has the same footprint as previous models, the upgrade is 20 percent heavier due to the greater ammo load.<ref>[http://www.defensemedianetwork.com/stories/bae-systems-developing-next-generation-mk-38-gun-mount/ BAE Systems Developing Next Generation Mk 38 Gun Mount] {{Webarchive|url=https://web.archive.org/web/20150403112109/http://www.defensemedianetwork.com/stories/bae-systems-developing-next-generation-mk-38-gun-mount/ |date=3 April 2015 }} – Defensemedianetwork.com, 24 September 2012</ref>


==Operators==
==Operators==
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*{{flag|Australia}}<ref>{{cite book|title=The Naval Institute Guide to Combat Fleets of the World: Their Ships, Aircraft, and Systems|editor=Wertheim, Eric|publisher=Naval Institute Press|location=Annapolis, MD|year=2007|edition=15th|isbn=978-1-59114-955-2|oclc=140283156|url=https://books.google.com/books?id=TJunjRvplU4C|page=22|access-date=25 October 2016|archive-url=https://web.archive.org/web/20140706135825/http://books.google.com/books?id=TJunjRvplU4C|archive-date=6 July 2014|url-status=live}}</ref>
*{{flag|Australia}}<ref>{{cite book|title=The Naval Institute Guide to Combat Fleets of the World: Their Ships, Aircraft, and Systems|editor=Wertheim, Eric|publisher=Naval Institute Press|location=Annapolis, MD|year=2007|edition=15th|isbn=978-1-59114-955-2|oclc=140283156|url=https://books.google.com/books?id=TJunjRvplU4C|page=22|access-date=25 October 2016|archive-url=https://web.archive.org/web/20140706135825/http://books.google.com/books?id=TJunjRvplU4C|archive-date=6 July 2014|url-status=live}}</ref>
**Army: [[ASLAV|ASLAV-25]]
**[[Australian Army|Army]]: [[ASLAV|ASLAV-25]]
**Navy: {{sclass|Armidale|patrol boat|1}}s, {{sclass|Hobart|destroyer|1}}s, {{sclass|Canberra|landing helicopter dock|1}}s
**[[Royal Australian Navy|Navy]]: {{sclass|Armidale|patrol boat|1}}s, {{sclass|Hobart|destroyer|1}}s, {{sclass|Canberra|landing helicopter dock|1}}s
*{{flag|Canada}}
*{{flag|Canada}}
**Army: [[Coyote reconnaissance vehicle]], [[LAV III#LAV 6|LAV VI]] APC
**[[Canadian Army|Army]]: [[Bison and Coyote armoured vehicles|Coyote reconnaissance vehicle]], [[LAV 6|LAV VI]] APC
**Navy: {{sclass|Harry DeWolf|offshore patrol vessel|1}}
**[[Royal Canadian Navy|Navy]]: {{sclass|Harry DeWolf|offshore patrol vessel|1}}
*{{GEO}}
* {{flag|Croatia}}
**[[Croatian Army|Army]]: [[M2 Bradley]]<ref>{{Cite web |last=U.S. Embassy in Zagreb |date=2023-12-03 |title=First Bradley M2A2 Infantry Fighting Vehicles Arrive in Croatia |url=https://hr.usembassy.gov/bradley-fighting-vehicles-arrive-in-rijeka-croatia/ |access-date=2024-01-02}}</ref>
⚫
**Coast Guard: {{sclass2|Island|patrol boat|1}}<ref>{{Cite web |url=http://civil.ge/eng/article.php?id=29475 |title=Civil.Ge &#124; U.S. Donates Two Patrol Boats to Georgian Coast Guard |access-date=19 August 2017 |archive-url=https://web.archive.org/web/20171212193627/http://www.civil.ge/eng/article.php?id=29475 |archive-date=12 December 2017 |url-status=live }}</ref>
⚫
*{{flag|Georgia}}
⚫
**[[Coast Guard of Georgia|Coast Guard]]: {{sclass2|Island|patrol boat|1}}<ref>{{Cite web |url=http://civil.ge/eng/article.php?id=29475 |title=Civil.Ge &#124; U.S. Donates Two Patrol Boats to Georgian Coast Guard |access-date=19 August 2017 |archive-url=https://web.archive.org/web/20171212193627/http://www.civil.ge/eng/article.php?id=29475 |archive-date=12 December 2017 |url-status=live }}</ref>
*{{flag|Israel}}
*{{flag|Israel}}
**Navy: {{sclass2|Super Dvora Mk III|patrol boat|1}}, {{sclass2|Shaldag|fast patrol boat|1}}
**[[Israeli Navy|Navy]]: {{sclass2|Super Dvora Mk III|patrol boat|1}}, {{sclass2|Shaldag|fast patrol boat|1}}
*{{flag|Malaysia}}
*{{flag|Malaysia}}
**Army: [[ACV-300|ACV-300 IFV]]
**[[Malaysian Army|Army]]: [[ACV-300|ACV-300 IFV]]
*{{flag|New Zealand}}
*{{flag|New Zealand}}
**Army: [[NZLAV]]
**[[New Zealand Army|Army]]: [[LAV III|NZLAV]]
**Navy: {{HMNZS|Canterbury|L421|6}} multi-role vessel and {{sclass2|Protector|offshore patrol vessel|1}}s
**[[Royal New Zealand Navy|Navy]]: {{HMNZS|Canterbury|L421|6}} multi-role vessel and {{sclass2|Protector|offshore patrol vessel|1}}s
*{{flag|Norway}}
*{{flag|Norway}}
⚫
*{{flag|Ukraine}}
⚫
**Coast Guard: [[Island-class patrol boat]] (2019)
*{{flag|Philippines}}
*{{flag|Philippines}}
**Army: [[Simba (APC)|GKN Simba AIFV]], [[M113 APC]]
**[[Philippine Army|Army]]: [[GKN Simba|GKN Simba AIFV]], [[Variants of the M113 armored personnel carrier#Philippines|M113 APC]]
**Navy: [[Gregorio del Pilar-class offshore patrol vessel|Del Pilar-class gun frigates]], [[Jacinto-class patrol vessel|Jacinto-class gun corvettes]], [[Cyclone-class patrol ship|''Mariano Alvarez''-class coastal patrol vessel]], and {{sclass|Jose Andrada|patrol craft|1}}
**[[Philippine Navy|Navy]]: {{sclass|Del Pilar|offshore patrol vessel|1}}, [[Jacinto-class patrol vessel]], [[Cyclone-class patrol ship|''Mariano Alvarez''-class coastal patrol vessel]], and {{sclass|Jose Andrada|patrol craft|1}}
*{{flag|Singapore}}<ref name="SAF"/><ref name="RSN"/><ref name="PCG"/>
*{{flag|Singapore}}<ref name="SAF"/><ref name="RSN"/><ref name="PCG"/>
**Army: [[Bionix AFV#Production models|Bionix 25]] (replaced by the [[Mk44 Bushmaster II|30mm Bushmaster II]] on the [[Bionix AFV#Production models|Bionix II]]), [[Variants of the M113 armored personnel carrier#Singapore|M113A2 Ultra IFV]]
**[[Singapore Army|Army]]: [[Bionix AFV#Production models|Bionix 25]] (replaced by the [[Mk44 Bushmaster II|30 mm Bushmaster II]] on the [[Bionix AFV#Production models|Bionix II]]), [[Variants of the M113 armored personnel carrier#Singapore|M113A2 Ultra IFV]]
**Navy: {{sclass|Endurance|landing platform dock|1}}, {{sclass|Formidable|frigate|1}}
**[[Republic of Singapore Navy|Navy]]: {{sclass|Endurance|landing platform dock|1}}, {{sclass|Formidable|frigate|1}}
**Police Coast Guard: [[Police Coast Guard#New Coastal Patrol Craft|New Coastal Patrol Craft (NCPC)]]
**[[Police Coast Guard]]: [[Police Coast Guard#New Coastal Patrol Craft|New coastal patrol craft (NCPC)]]
*{{flag|Spain}}
*{{flag|Spain}}
**Army: [[VEC-M1]]
**[[Spanish Army|Army]]: [[VEC-M1]]
**[[Spanish Navy|Navy]]: {{sclass|Meteoro|offshore patrol vessel|1}}
**Navy: [[Buque de Acción Marítima|BAM]]
*{{flag|Sri Lanka}}<ref name="JNI"/>
*{{flag|Sri Lanka}}<ref name="JNI"/>
**[[Sri Lanka Navy|Navy]]: {{sclass|Hamilton|cutter|1}},<ref>{{Cite web |first=Zulfick |last=Farzan |title=Sri Lanka Navy takes delivery of Ex-USCGC Douglas Munro |url=https://english.newsfirst.lk/2021/10/27/sri-lanka-navy-takes-delivery-of-ex-uscgc-douglas-munro |access-date=2024-02-20 |website=News 1st |language=en |date=2021-10-27 }}</ref> {{sclass2|Reliance|cutter|1}}
*{{flag|Switzerland}}
*{{flag|Switzerland}}
*{{flag|Turkey}}
*{{flag|Turkey}}
*{{flag|Ukraine}}
**[[Ukrainian Ground Forces|Army]]: [[M2 Bradley#M2A2 ODS/ODS-E|Bradley M2A2 ODS]] & [[Bradley Fighting Vehicle#M7 Bradley Fire Support Vehicle|M7 Bradley fire support vehicle]]<ref>{{cite news |last1=Stone |first1=Mike |last2=Charlish |first2=Alan |last3=Hovet |first3=Jason |last4=Blair |first4=Edmund |date=20 January 2023 |title=Factbox: Ukraine's military supplies: What ground vehicles are Kyiv's allies sending? |work=Reuters |url=https://www.reuters.com/world/europe/ukraines-military-supplies-what-ground-vehicles-are-kyivs-allies-sending-2023-01-20/ |access-date=24 January 2023}}</ref><ref>{{cite press release |url= https://www.defense.gov/News/Releases/Release/Article/3261263/more-than-3-billion-in-additional-security-assistance-for-ukraine/ |title=More Than $3 Billion in Additional Security Assistance for Ukraine |publisher= [[United States Department of Defense]] |date=6 January 2023 |access-date=6 January 2023}}</ref><ref>{{cite press release |url= https://www.defense.gov/News/Releases/Release/Article/3272866/biden-administration-announces-additional-security-assistance-for-ukraine/ |title=Biden Administration Announces Additional Security Assistance for Ukraine |publisher=[[United States Department of Defense]] |date=19 January 2023 |access-date=19 January 2023}}</ref>,[[LAV 6|LAV VI]]
⚫
**[[Ukrainian Navy]]: [[Island-class patrol boat]] (2019)
*{{flag|United States}}
*{{flag|United States}}
**Army: [[Bradley Fighting Vehicle|M2/M3 Bradley]]
**[[United States Army|Army]]: [[Bradley Fighting Vehicle|M2/M3 Bradley]]
**Navy (Mk. 38 Mod 0, Mk. 38 Mod 2 and Mk. 38 Mod 3): {{sclass|Nimitz|aircraft carrier|1}}, {{sclass|Arleigh Burke|destroyer|1}}, {{sclass|Ticonderoga|cruiser|1}}, {{sclass|Oliver Hazard Perry|frigate|1}}, {{sclass|Wasp|amphibious assault ship|1}}, {{sclass|Tarawa|amphibious assault ship|1}}, {{sclass|Whidbey Island|dock landing ship|1}}, {{sclass|Harpers Ferry|dock landing ship|1}}, {{sclass|Austin|amphibious transport dock|1}}, {{sclass|Blue Ridge|command ship|1}}, {{sclass|Cyclone|patrol ship|1}}, [[Mark VI patrol boat]]
**[[United States Navy|Navy]] (Mk. 38 Mod 0, Mk. 38 Mod 2 and Mk. 38 Mod 3): {{sclass|Nimitz|aircraft carrier|1}}, {{sclass|Arleigh Burke|destroyer|1}}, {{sclass|Ticonderoga|cruiser|1}}, {{sclass|Oliver Hazard Perry|frigate|1}}, {{sclass|Wasp|amphibious assault ship|1}}, {{sclass|Tarawa|amphibious assault ship|1}}, {{sclass|Whidbey Island|dock landing ship|1}}, {{sclass|Harpers Ferry|dock landing ship|1}}, {{sclass|Austin|amphibious transport dock|1}}, {{sclass|Blue Ridge|command ship|1}}, {{sclass|Cyclone|patrol ship|1}}, [[Mark VI patrol boat]]
**Marine Corps: [[LAV-25]]
**[[United States Marine Corps|Marine Corps]]: [[LAV-25]]
**Coast Guard (Mk. 38 Mod 0, Mk. 38 Mod 2 and Mk. 38 Mod 3): [[Medium endurance cutter|Reliance-class cutter]], {{sclass|Hamilton|cutter|1}}, {{sclass2|Sentinel|cutter|1}}, {{sclass2|Island|cutter|1}}, {{USCGC|Alex Haley|WMEC-39|6}}, future [[Heritage-class cutter]]<ref>{{cite web|title=MK 38 – 25 MM MACHINE GUN SYSTEM|url=http://www.navy.mil/navydata/fact_display.asp?cid=2100&tid=500&ct=2|website=Navy.mil|publisher=US Navy|access-date=16 February 2017|archive-url=https://web.archive.org/web/20170217064712/http://www.navy.mil/navydata/fact_display.asp?cid=2100&tid=500&ct=2|archive-date=17 February 2017|url-status=live}}</ref>
**[[United States Coast Guard|Coast Guard]] (Mk. 38 Mod 0, Mk. 38 Mod 2 and Mk. 38 Mod 3): [[Medium endurance cutter|Reliance-class cutter]], {{sclass|Hamilton|cutter|1}}, {{sclass2|Sentinel|cutter|1}}, {{sclass2|Island|cutter|1}}, {{USCGC|Alex Haley|WMEC-39|6}}, future [[Heritage-class cutter]]<ref>{{cite web|title=MK 38 – 25 MM MACHINE GUN SYSTEM|url=http://www.navy.mil/navydata/fact_display.asp?cid=2100&tid=500&ct=2|website=Navy.mil|publisher=US Navy|access-date=16 February 2017|archive-url=https://web.archive.org/web/20170217064712/http://www.navy.mil/navydata/fact_display.asp?cid=2100&tid=500&ct=2|archive-date=17 February 2017|url-status=live}}</ref>
<!--READ FIRST: This section is for cited entries only. Please do not add entries into this list without a citation from a reliable source. All entries without a citation will be removed. Thank you.-->
<!--READ FIRST: This section is for cited entries only. Please do not add entries into this list without a citation from a reliable source. All entries without a citation will be removed. Thank you.-->


Line 181: Line 183:
*[[Bushmaster III|Bushmaster III 35/50 mm chain gun]]
*[[Bushmaster III|Bushmaster III 35/50 mm chain gun]]
*[[Bushmaster IV|Bushmaster IV 40 mm chain gun]]
*[[Bushmaster IV|Bushmaster IV 40 mm chain gun]]
*[[30mm DS30M Mark 2 Automated Small Calibre Gun]] British automated mount with 30mm Bushmaster II
*[[30mm DS30M Mark 2 Automated Small Calibre Gun]] British automated mount with 30 mm Bushmaster II
*[[Shipunov 2A42]] 30mm automatic cannon
*[[List of weapons of the United States Marine Corps]]
*[[List of weapons of the United States Marine Corps]]
*[[List of crew-served weapons of the U.S. Armed Forces]]
*[[List of crew-served weapons of the U.S. Armed Forces]]
Line 189: Line 192:
{{reflist|30em}}
{{reflist|30em}}
;Bibliography
;Bibliography
*{{cite book |editor-first=George M. (Lt.Col., USMC, Retd) |editor-last=Chinn |title=The Machine Gun: History, Evolution, and Development of Manual, Automatic, and Airborne Repeating Weapons |volume=V |publisher=Edward Brothers Publishing Co. |location=Ann Arbor, Michigan |year=1987 |url=http://www.ibiblio.org/hyperwar/USN/ref/MG/V/MG-V5.pdf |access-date=28 April 2019}}
*{{cite book |editor-first=George M. |editor-last=Chinn |title=The Machine Gun: History, Evolution, and Development of Manual, Automatic, and Airborne Repeating Weapons |volume=V |publisher=Edward Brothers Publishing Co. |location=Ann Arbor, Michigan |year=1987 |url=http://www.ibiblio.org/hyperwar/USN/ref/MG/V/MG-V5.pdf |access-date=28 April 2019}}


==External links==
==External links==
Line 196: Line 199:
*[http://www.fas.org/man/dod-101/sys/ac/equip/m242.htm Federation of American Scientists: M242]
*[http://www.fas.org/man/dod-101/sys/ac/equip/m242.htm Federation of American Scientists: M242]
*[http://www.navweaps.com/Weapons/WNUS_25mm_mk38.htm NavWeaps.Com: 25 mm/87 (1") Mark 38 Machine Gun System ]
*[http://www.navweaps.com/Weapons/WNUS_25mm_mk38.htm NavWeaps.Com: 25 mm/87 (1") Mark 38 Machine Gun System ]
*U. S. Army Field Manual 3-22.1
*[https://web.archive.org/web/20060629232015/http://www.sfu.ca/casr/101-m242.htm Canadian-American Strategic Review: M242]
*[https://web.archive.org/web/20060629232015/http://www.sfu.ca/casr/101-m242.htm Canadian-American Strategic Review: M242]


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[[Category:United States Marine Corps equipment]]
[[Category:United States Marine Corps equipment]]
[[Category:Alliant Techsystems]]
[[Category:Alliant Techsystems]]
[[Category:Machine guns]]
[[Category:Machine guns of the United States]]

Latest revision as of 05:02, 12 May 2024

"M242" redirects here. For the Israeli Jeep derivative, see AIL Storm § Storm II.
M242 Bushmaster
U.S. Army press photo of a M242 Bushmaster
TypeChain gun
Place of originUnited States
Service history
In service1981–present
Used bySee Operators
Production history
DesignerHughes Helicopters[1][2]
Designed1976
ManufacturerHughes Helicopters (1981–1985)[1][3]
McDonnell Douglas Helicopters (1985–2002)[3]
Alliant Techsystems (2002–2015)[3]
Orbital ATK (2015–2018)[3]
Northrop Grumman Innovation Systems (2018–present)[3]
Produced1981–present
No. built>11,000[4]
VariantsSee variants
Specifications
Mass119 kilograms (262 lb)[4]
Length2,672 mm (105.2 in)[4]
Barrel length2,175 mm (85.6 in)
Width318 mm (12.5 in)[4]
Height373 mm (14.7 in)[4]
Shell25 × 137 mm
BarrelsSingle barrel (progressive RH parabolic twist)
ActionExternally powered, chain driven, open bolt
Rate of fireCyclic: 200 rpm with 1 hp or 500 rpm with 8 hp
Muzzle velocity1,100 metres per second (3,600 ft/s)
Effective firing range3,000 metres (9,800 ft)
Maximum firing range6,800 metres (22,300 ft)

The M242 Bushmaster chain gun is a 25 mm (25×137mm) single-barrel chain-driven autocannon. It is used extensively by the U.S. military, such as in the Bradley fighting vehicle, as well as by other NATO members and some other nations in ground combat vehicles and various watercraft. Hughes Helicopters in Culver City, California, was the original designer and manufacturer.[1][2] As of 2019, Northrop Grumman Innovation Systems produces the gun.[4]

It is an externally-powered, chain-driven, single-barrel weapon that may be fired in semi-automatic, burst, or automatic modes. It is fed by a metallic link belt and has dual-feed capability. The term chain gun derives from the use of a roller chain that drives the bolt back and forth. The gun can destroy lightly armored vehicles and aerial targets (such as helicopters and other slow-flying aircraft). It can also apply suppression fire against exposed troops, dug-in positions, and occupied built-up areas. The standard rate of fire is 200 rounds per minute. The weapon has an effective range of 2,000 metres (6,600 ft),[5] depending on the type of ammunition used. With over 11,000 units sold worldwide, it is one of the most successful modern autocannons.[4]

Description

[edit]
Close up of the MK 38 naval variant

Unlike most automatic firearms, the M242 does not depend on gas or recoil to actuate its firing system. Instead, it uses a 1 hp (0.75 kW) DC motor, positioned in the receiver to drive the chain and dual-feed system. This system uses sprockets and extractor grooves to feed, load, fire, extract, and eject rounds. A system of clutches provides for an alternate sprocket to engage and thus allows the gunner to switch between armor-piercing and high-explosive rounds.

The weapon assembly consists of three parts: the barrel assembly, the feeder assembly, and the receiver assembly. The three-part structure makes it possible for a two-person team to install or remove the system (under ideal conditions) despite its considerable total weight.

The M242 weapon system has both electrical and manual fire control and can be operated electrically or manually. The gunner can choose from three rates of fire:

  • Single shot semi-automatic, in which the gunner can shoot as fast as the trigger can be operated, limited only by the electrical drive speed (it cannot exceed the "high rate" firing speed).
  • Low rate fully automatic, in which the weapon fires 100 rounds per minute, ± 25 rounds.
  • High rate fully automatic, in which the weapon fires 200 rounds per minute, ± 25 rounds.

History

[edit]
An enhanced M242 with a fluted barrel on an M2 Bradley (the top-mounted metal box and spotlight are MILES training attachments, not part of the gun system).

The Bushmaster project started as an offshoot of the US Army's MICV-65 program that was attempting to introduce a new infantry fighting vehicle to replace their existing M113 armored personnel carriers. Part of this program called for a new scout vehicle to replace the M114, a parallel development taking place under the XM800 Armored Reconnaissance Scout Vehicle. Both the XM800 and the cavalry version of the XM701 MICV vehicles were armed with the M139, a US-built version of the Hispano-Suiza HS.820 20 mm autocannon. During the testing phase, the Army eventually rejected the XM701 and started work on a newer design known as the XM723. Soon after the XM800 was also rejected. This led to the combination of the two programs, moving the scout role to the cavalry version of the XM723.

At the same time, the M139 proved to be disappointing and a contract for a new weapon to replace it started as a competitive development in 1972 simultaneously at Ford's Aeronutronic Division with the PFB-25 (self-powered weapon) and the Hughes Helicopters' Ordnance Division (externally-powered,)[2] under the Summa Corporation as the Vehicle Rapid-Fire Weapons System-Successor, or VRFWS-S. This was essentially a power-driven gun firing similar 20 mm ammunition to the HS.820, the power-driven mechanism was to ensure operation even in the case of a misfire.

Progress on the VRFWS-S was slow, and eventually resulted in a switch to a much more powerful, 25 mm, round. Similar delays in the MICV program meant the ultimate vehicles descending from their efforts, the M2/M3 Bradley fighting vehicle, did not enter production until 1981, by which point the Bushmaster had matured. Since 1990, there have been several enhancements made upon the weapon, resulting in the enhanced 25 mm gun.

To date, more than 10,500 weapons are in service. One of the major reasons for this popularity is the extremely reliable nature of the weapon. It has a rating of 22,000 mean rounds between failure (MRBF), much higher than many comparable devices.

Ammunition

[edit]
M793 target practice with tracer (TP-T) rounds for the MK-38 being inspected
MK210 high explosive incendiary with tracer (HEI-T)

A wide range of ammunition has been developed for this weapon, providing it with the capability to defeat the majority of armored vehicles it is likely to encounter, up to and including some light tanks, including an encounter during the war in Ukraine where a Russian T-90M main battle tank was forced to be abandoned. The ammunition used in the M242 may also be used in a variety of weapons such as the GAU-12 Equalizer, the French Giat M811, or the Swiss Oerlikon KBA weapon system. It has the capability to fire U.S. manufactured ammunition as well as the NATO equivalents thereof. Primarily though, it fires six types of rounds: the M791, M792, M793, M910, MK210, and M919.

M791 armor-piercing discarding sabot with tracer
The APDS-T penetrates lightly armored vehicles, self-propelled artillery, and aerial targets such as helicopters and various slow-moving, fixed-wing aircraft.
M792 high explosive incendiary with tracer and self destruct
The HEI-T can destroy unarmored vehicles and helicopters and suppress anti-tank missile positions and enemy squads out to a maximum effective range of 2,200 meters.
M793 target practice with tracer
The TP-T cartridge is a fixed-type, percussion-primed training round that matches the high explosive incendiary with tracer (HEI-T M792) round ballistically. The TP-T's tracer is visible out to 2,000 meters, however, the round has a maximum effective range (accuracy-limited) of 1,600 meters.
M910 target practice discarding sabot with tracer
The TPDS-T replicates the flight pattern of the M791 armor piercing discarding sabot with tracer (APDS-T) round. The TPDS-T allows units to realistically practice sabot engagements.
MK210 high explosive incendiary with tracer
Used by the U. S. Navy in their Mk38 naval weapon system.
M919 armor-piercing, fin-stabilized discarding sabot with tracer.
The APFSDS-T round penetrates lightly armored vehicles, self-propelled artillery, and aerial targets, which include helicopters and slow-moving fixed-wing aircraft. The dart is made of depleted uranium.

Variants

[edit]

The M242 is currently in use by the United States Army, the United States Navy, the United States Marine Corps, the United States Coast Guard, the New Zealand Army, the Royal New Zealand Navy, the Norwegian Army, the Spanish Army, the Sri Lanka Navy, the Swiss Army, the Canadian Army, the Royal Canadian Navy, the Australian Army, the Royal Australian Navy, the Israeli Navy, the Philippine Navy, the Philippine Army, the Singapore Army, and the Republic of Singapore Navy as well as several others, including since 2023 the Armed Forces of Ukraine.[6] The wide usage has resulted in several variations and modifications on the standard M242 weapon system.

Ground vehicles

[edit]
A U.S. Marine Corps LAV-25A2 firing its M242 Bushmaster during a live-fire exercise, circa 2014

The M242 is standard equipment on the U. S. Army M2 and M3 Bradley fighting vehicles; it is also in use on the LAV-25. Before the project was cancelled, the Mk44 Bushmaster II 30 mm chain gun (a successor to the M242) was used on the Marine Corps' Expeditionary Fighting Vehicle (EFV).

The M242 is also a popular choice of primary armament for armored fighting vehicles manufactured around the world, such as Singapore's Bionix AFVs and as the Rafael Overhead Weapon Station-25 mounted on upgraded M113A2 Ultra IFVs.[7]

Enhanced 25 mm gun

[edit]

Work on an upgraded weapon began in 1990. In the upgrade program, all three major systems and seven minor systems were improved. The modifications began with introducing a chrome-lined barrel, an enhanced feeder, and an enhanced receiver. The weapon systems also received minor upgrades such as quick-detachable link covers, a larger breech assembly, a high efficiency muzzle brake, longer recoil, an integral round counter, an extended life firing pin and spring, and a triple-spring drive clutch. Upgraded weapons were first put to use on the M2A3 Bradley, the fourth version of the M2 Bradley fighting vehicle.

[edit]
Main article: Mark 38 25 mm Machine Gun System

In 1977, the U. S. Navy realized that it needed a replacement for the Oerlikon 20 mm Mk 16 series of guns. In 1986, this requirement was satisfied with the introduction of the Mk 38 Mod 0 weapons system. A derivative of the M242 system, the Mk 38 consists of the M242 chain gun and the Mk 88 Mod 0 machine gun mount. It provides ships with defensive and offensive gunfire capability for the engagement of a variety of surface targets. Designed primarily as a close-range defensive measure, it provides protection against patrol boats, floating mines, and various shore-based targets.

Mk 38 Mod 2 and Mod 3

[edit]
See also: Typhoon Weapon System

Recently, several US Navy platforms have been outfitted with a newer version, the Typhoon Weapon System designated Mk 38 Mod 2,[8][9] which is remotely operated and includes an electronic optical sight, laser range-finder, FLIR, and a more reliable feeding system, enhancing the weapon system's capabilities and accuracy. In 2006 the Sri Lanka Navy added the M242 to its fleet of fast attack craft.[10]

The system is also in use by the Republic of Singapore Navy's Formidable-class frigates and Endurance-class landing platform dock ships[11] and were deployed as part of coalition forces' port security efforts in Iraq as well as anti-piracy roles in the Gulf of Aden.[12] Aside from that, the Singapore Police Coast Guard's new coastal patrol craft (NCPC) has adopted the system as its main armament.[13]

The Mod 3 updates electronics and adds a coaxial 7.62 mm machine gun with a 570-round-per-minute rate of fire.[14][15][16]

Aselsan STOP

[edit]
See also: Aselsan STOP

Turkish made Aselsan STOP stabilized weapon station can be fitted with an M242 Bushmaster.[17]

  • Weapons station for the remote controlled M242 on the multi-role vessel HMNZS Canterbury
    Weapons station for the remote controlled M242 on the multi-role vessel HMNZS Canterbury
  • The United States Marine Corps' LAV-25.
    The United States Marine Corps' LAV-25.
  • An Mk38. The M242 has a characteristic fluted gun barrel to reduce weight and assist cooling.[18]
    An Mk38. The M242 has a characteristic fluted gun barrel to reduce weight and assist cooling.[18]
  • A Mk 38 MOD 2 25 mm autocannon gun system aboard the amphibious dock landing ship USS Pearl Harbor forward ejecting the spent casings.
    A Mk 38 MOD 2 25 mm autocannon gun system aboard the amphibious dock landing ship USS Pearl Harbor forward ejecting the spent casings.

BAE and Boeing teamed together after a March 2011 contract to add a directed energy weapon to the Mk 38 Mod 2 gun mount, known as the Mk 38 Mod 2 tactical laser system. The TLS combines a Boeing-designed solid-state laser with the existing BAE-manufactured Mk 38 mount to deliver high-precision accuracy against fast surface and air threats including speed boats and unmanned aerial vehicles (UAVs). Laser power levels can be adjusted depending on the target and mission objectives.[19][20] Originally, the system was armed with a 10 kW laser, but in April 2017 BAE announced they had increased power to 60 kW.[21]

Proposed upgrades

[edit]

In April 2012, BAE unveiled a potential version of the system mount, developed in collaboration with Rafael Advanced Defense Systems. It is visually distinctive from previous versions with its stealthy housing, which also protects the gun from weather and allows for easier access to internal components through large access panels. The upgrade mounts a larger Alliant Techsystems Mk44 Bushmaster II 30 mm cannon for a 500-meter range increase, as well as a coaxial .50 caliber M2 heavy machine gun. Elevation is increased to +75 degrees for engaging UAVs and helicopters, and ammunition storage is greater at 420 30 mm rounds. Other features include a larger manual fire control panel, an offset mode specifically for firing warning shots, and a surveillance mode where the gun can be pointed away from a target but the EO sensor remains pointed in the target direction. Although it has a high degree of commonality and has the same footprint as previous models, the upgrade is 20 percent heavier due to the greater ammo load.[22]

Operators

[edit]
Map with M242 operators in blue

See also

[edit]

References

[edit]
Notes
  1. ^ a b c Chinn, George M., 1987, pp. 455–456.
  2. ^ a b c Fiscal Year 1977 Authorization for Military Procurement, pt. 6., p. 3242.
  3. ^ a b c d e "Trademark Assignment Abstract of Title". United States Patent and Trademark Office. 12 November 2018. Archived from the original on 7 May 2016. Retrieved 28 April 2019.
  4. ^ a b c d e f g "Northrop Grumman M242 25mm BUSHMASTER chain gun fact sheet" (PDF). 2018. Archived (PDF) from the original on 28 April 2019. Retrieved 28 April 2019.
  5. ^ "M242 Bushmaster 25mm Automatic Gun". GlobalSecurity.org. Retrieved 6 June 2023.
  6. ^ Barnes, Joe (18 January 2024). "Watch: Russia's most advanced tank destroyed by US Bradley fighting vehicle". The Telegraph.
  7. ^ a b "Factsheet – Technical Specifications of Ultra M113" (Press release). Ministry of Defence, Singapore. 16 June 1998. Archived from the original on 25 October 2017. Retrieved 28 October 2010. [Last updated on 12 June 2010]
  8. ^ "Mk 38 Mod 2 Machine Gun System (MGS)". BAE Systems. Archived from the original on 8 March 2009. Retrieved 24 October 2010.
  9. ^ "Typhoon: Naval Stabilized & Remotely Operated Gun System" (PDF). Archived from the original (PDF) on 2 December 2012. Retrieved 26 August 2010.
  10. ^ a b Sri-Lanka learns to counter Sea Tigers’ swarm tactics, JANE’S NAVY INTERNATIONAL Archived 3 November 2011 at the Wayback Machine, Jane's Information Group.
  11. ^ a b "RSN – Assets – Weapons". Ministry of Defence (Singapore) (MINDEF). 23 July 2010. Archived from the original on 20 July 2008. Retrieved 15 September 2010.
  12. ^ "The Next Wave". MINDEF. 6 May 2010. Archived from the original on 14 October 2017. Retrieved 15 September 2010.
  13. ^ a b Muhammad Juffry, Bin Joihani (July–August 2009). "PCG upgrades with new fleet and training centre". Police Life Monthly. 35 (7). Singapore: Singapore Police Force. ISSN 0217-8699. Archived from the original on 22 June 2011. Retrieved 8 November 2010.
  14. ^ "MK 38 – 25 mm Machine Gun System". United States Navy Fact File. Archived from the original on 3 November 2018. Retrieved 6 April 2019.
  15. ^ "Mk 38 Mod 3 Machine Gun System (MGS)". BAE Systems. Archived from the original on 6 April 2019. Retrieved 6 April 2019.
  16. ^ "Contracts for June 29, 2018". U.S. Department of Defense Search Defense.gov: Search. Archived from the original on 6 April 2019. Retrieved 6 April 2019.
  17. ^ "25 mm STOP Remote Controlled Stabilized Naval Gun System". Aselsan. Retrieved 8 July 2021.
  18. ^ Joel Avila. "The Real Benefits of Barrel Fluting". www.snipercountry.com. Archived from the original on 24 October 2014. Retrieved 25 August 2014.
  19. ^ BAE Putting Lasers on Mk 38 Naval Gun Archived 12 November 2014 at the Wayback Machine – Defensetech.org, 25 July 2011
  20. ^ Boeing and BAE team up to develop laser weapon for the U.S. Navy Archived 2 November 2014 at the Wayback Machine – Gizmag.com, 26 July 2011
  21. ^ BAE Systems Unveils a 60 kW Variant of the MK 38 Tactical Laser System Archived 6 April 2017 at the Wayback Machine – Navyrecognition.com, 4 April 2017
  22. ^ BAE Systems Developing Next Generation Mk 38 Gun Mount Archived 3 April 2015 at the Wayback Machine – Defensemedianetwork.com, 24 September 2012
  23. ^ Wertheim, Eric, ed. (2007). The Naval Institute Guide to Combat Fleets of the World: Their Ships, Aircraft, and Systems (15th ed.). Annapolis, MD: Naval Institute Press. p. 22. ISBN 978-1-59114-955-2. OCLC 140283156. Archived from the original on 6 July 2014. Retrieved 25 October 2016.
  24. ^ U.S. Embassy in Zagreb (3 December 2023). "First Bradley M2A2 Infantry Fighting Vehicles Arrive in Croatia". Retrieved 2 January 2024.
  25. ^ "Civil.Ge | U.S. Donates Two Patrol Boats to Georgian Coast Guard". Archived from the original on 12 December 2017. Retrieved 19 August 2017.
  26. ^ Farzan, Zulfick (27 October 2021). "Sri Lanka Navy takes delivery of Ex-USCGC Douglas Munro". News 1st. Retrieved 20 February 2024.
  27. ^ Stone, Mike; Charlish, Alan; Hovet, Jason; Blair, Edmund (20 January 2023). "Factbox: Ukraine's military supplies: What ground vehicles are Kyiv's allies sending?". Reuters. Retrieved 24 January 2023.
  28. ^ "More Than $3 Billion in Additional Security Assistance for Ukraine" (Press release). United States Department of Defense. 6 January 2023. Retrieved 6 January 2023.
  29. ^ "Biden Administration Announces Additional Security Assistance for Ukraine" (Press release). United States Department of Defense. 19 January 2023. Retrieved 19 January 2023.
  30. ^ "MK 38 – 25 MM MACHINE GUN SYSTEM". Navy.mil. US Navy. Archived from the original on 17 February 2017. Retrieved 16 February 2017.
Bibliography
[edit]
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