Editing Alliant Techsystems (section)

====Bushmaster autocannons====
[[File:USS Chosin (CG-65) 25mm M242 Bushmaster Autocannon (2).jpg|thumb|[[USS Chosin|USS ''Chosin'']] (CG-65) cruiser's 25mm [[M242 Bushmaster]] autocannon]]
[[File:Oshkosh JLTV.jpg|thumb|2016: [[Oshkosh L-ATV]] (configured as [[JLTV]]) with EOS R-400S-MK2 remote weapon system armed with [[Orbital ATK]]'s [[M230 chain gun|M230-LF 30mm]] lightweight automatic [[chain gun]].]]

The [[M242 Bushmaster]] is a [[25 mm caliber|25 mm (25×137mm)]] [[chain gun|chain-fed]] [[autocannon]]. It is used extensively by the [[United States armed forces|United States]] and [[NATO]] forces in ground [[combat vehicle]]s and watercraft. Originally, the weapon was designed and manufactured by [[McDonnell Douglas]]. It is an externally powered, chain driven, single-barrel weapon which 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 suppress enemy positions such as 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.

The [[Mk44 Bushmaster II]] is a [[30 mm caliber|30 mm]] [[chain gun]] also manufactured by ATK.  It is a derivative of the [[25 mm caliber|25 mm]] M242 referenced above and uses 70% of the same parts as the M242. The Mk 44 Bushmaster II is the standard primary armament of the [[Bionix AFV|Bionix-II AFV]] currently in service with the [[Singapore Army]], the [[KTO Rosomak]] in [[Polish Army|Polish]] service as well as that of the [[CV90|CV90 AFV]]s in [[Finnish Army|Finnish]], [[Norwegian Army|Norwegian]] and [[Swiss Army|Swiss]] service. Some [[United States Navy]] vessels, such as the new [[San Antonio-class amphibious transport dock|''San Antonio''-class amphibious transport dock]] are armed with the Bushmaster II for surface threat defense.<ref>{{cite web |url=http://www.nwfdailynews.com/share/profiles/?slid=52836bbc-64ad-c2d4-9dae-291a895b67d1&plckController=PersonaBlog&plckScript=personaScript&plckElementId=personaDest&plckPersonaPage=BlogViewPost&plckPostId=Blog%3a52836bbc-64ad-c2d4-9dae-291a895b67d1Post%3a4d252120-6dcd-4132-b823-23038489868d&sid=sitelife.nwfdailynews.com |title=Air Force Cancels 30 mm Cannon Program for AC-130U Gunships - Inside the Air Force, 11 July 2008 |url-status=dead |archive-url=https://web.archive.org/web/20110928133016/http://www.nwfdailynews.com/share/profiles/?slid=52836bbc-64ad-c2d4-9dae-291a895b67d1&plckController=PersonaBlog&plckScript=personaScript&plckElementId=personaDest&plckPersonaPage=BlogViewPost&plckPostId=Blog%3A52836bbc-64ad-c2d4-9dae-291a895b67d1Post%3A4d252120-6dcd-4132-b823-23038489868d&sid=sitelife.nwfdailynews.com |archive-date=September 28, 2011 |df=mdy-all }}</ref>

The XM813 Bushmaster, also produced by ATK Defense, is based on the Mk44 and is offered as an upgrade for [[M1126 infantry carrier vehicle|M1126 Stryker]] and [[M2 Bradley]].  Improvements include a one-inch longer barrel, integral mount to increase first round hit probability by up to 10 percent, and dual recoil system to enhance accuracy and cope with future hotter propellants.  It can have a next-round select, linkless feed system.  The 30&nbsp;mm chain gun can fire Mk310 Programmable [[Air burst|Air Burst]] Munition rounds to attack targets in defilade.  The [[United States Army Research, Development and Engineering Command]] helped enhance the XM813 mainly for safety and turret integration.  By changing five parts, the gun caliber can be increased to 40&nbsp;mm.  As of November 2013, the XM813 was being tested at [[Aberdeen Proving Ground]].<ref>{{cite web |url=http://www.dtic.mil/ndia/2012armaments/Wednesday14027hart.pdf |title=Archived copy |access-date=2013-12-08 |url-status=dead |archive-url=https://web.archive.org/web/20130719192202/http://www.dtic.mil/ndia/2012armaments/Wednesday14027hart.pdf |archive-date=July 19, 2013 |df=mdy-all }}</ref><ref>[http://www.armytimes.com/article/20131108/NEWS/311080016/ Bigger, badder Bushmaster cannon in the works] - Armytimes.com, 8 November 2013</ref>