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The Mk44 Bushmaster II is a 30 mm chain gun manufactured by Northrop Grumman. It is a derivative of the 25 mm M242 Bushmaster , and uses 70% of the same parts as the M242 while increasing the firepower by as much as 50% with the 20% increase in caliber size.
The XM813 Bushmaster, also produced by ATK Defense, is based on the Mk44 and is offered as an upgrade for 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.
The cannon is a larger and more modern version of the 35 mm Bushmaster III chain gun, which itself is a larger version of the 25 mm M242 Bushmaster cannon. Although its shells, 50 x 228 mm, are twice the diameter of the 25×137mm cartridge of the M242, the 50mm cannon is not much longer than the smaller weapon. [ 2 ]
The Kongsberg turret and Orbital ATK XM813 variant of the Mk44 Bushmaster were officially selected in December 2015. [93] Kongsberg later renamed the turret system the RT40 (Remote Turret). [94] The first upgraded Stryker, designated XM1296 "Dragoon", was delivered for testing in October 2016, with fielding to begin in May 2018. [95]
This variant weight 35 t (77,000 lb), and has a payload of 3.30 t (7,300 lb). It is equipped with a Kongsberg RT-20 remote turret using the Mk44 Bushmaster II (XM813) chain gun, with a calibre of 30×173mm. In August 2022, the USMC awarded BAE System with a contract to manufacture multiple production-ready test vehicles (PRTV) for US$88 million.
The M242 25 mm chain gun. A chain gun is a type of autocannon or machine gun that uses an external source of power to cycle the weapon's action via a continuous loop of chain, similar to that used on a motorcycle or bicycle, instead of diverting excess energy from the cartridges' propellant as in a typical automatic firearm.
The M230 Cannon is a 30 mm (30×113 mm), single-barrel electrically-driven autocannon, using external electrical power (as opposed to recoil or expanding gas generated by the firing cartridge) to cycle the weapon between shots.
The Bushmaster Protected Mobility Vehicle or Infantry Mobility Vehicle is an Australian-built four-wheel drive armoured vehicle. The Bushmaster was primarily designed by the then government-owned Australian Defence Industries (ADI), and is currently produced by Thales Australia following their acquisition of ADI.
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