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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.
The primary component of the Mk 38 is the 25 mm M242 Bushmaster. It is an externally-powered, chain-driven gun. The Bushmaster uses an electric motor to drive the moving parts for ammunition feeding, loading, firing, extraction, and cartridge ejection. [2] The mass of the M242 on the Mark 38 MGS is 109 kg (240 lb). [3]
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 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 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 ]
A M242 Bushmaster chain gun is fitted on a LAV III's gun turret, with a machine gun placed atop the turret. The LAV III is fitted with a two-man turret, armed with the M242 Bushmaster 25 mm caliber chain gun and a coaxial 7.62-mm machine gun. One more 5.56 mm or 7.62 mm machine guns is positioned on top of the turret.
After the Second World War, autocannons continued to serve as a versatile weapon in land, sea, and air applications. Examples of modern autocannons include the 25 mm Oerlikon KBA mounted on the IFV Freccia, [8] the M242 Bushmaster mounted on the M2/M3 Bradley, updated versions of the Bofors 40 mm gun, and the Mauser BK-27.
It is a derivative of the 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-II AFV currently in service with the Singapore Army, the KTO Rosomak in Polish service as well as that of the CV90 AFVs in Finnish, Norwegian and Swiss service.