The M242 Bushmaster is a 25 mm (25×137mm) chain-driven autocannon. It is utilized broadly by the US military, and by NATO's and some other countries' powers in ground battle vehicles, for example, the Bradley battling vehicle and different watercraft. Initially the weapon was outlined and fabricated by McDonnell Douglas (later obtained by the Boeing Corporation); nonetheless it is presently delivered by Alliant Techsystems (ATK) of Mesa, Arizona.
It is a remotely fueled, chain-driven, single-barrel weapon which might be discharged in self-loader, burst, or programmed modes. It is encouraged by a metallic connection belt and has double bolster capacity. The expression "chain weapon" gets from the utilization of a roller chain that drives the jolt forward and backward. The firearm can devastate gently defensively covered vehicles and ethereal targets, (for example, helicopters and moderate flying machine). It can likewise smother adversary positions, for example, uncovered troops, dove in positions, and involved developed territories. The standard rate of flame is 200 rounds for each moment. The weapon has a viable scope of 3,000 meters (9,800 ft), contingent upon the sort of ammo utilized. With more than 10,000 units sold around the world, it is a standout amongst the best current autocannons.Part of this system required another scout vehicle to supplant the M114, a parallel improvement occurring under the XM800 Armored Reconnaissance Scout Vehicle. Both the XM800 and the mounted force variant of the XM701 MICV vehicles were furnished with the M139, a US-manufactured rendition of the Hispano-Suiza HS.820 20 mm autocannon. Amid the testing stage, the Army inevitably dismisses the XM701 and began take a shot at a more up to date plan known as the XM723. Not long after the XM800 was likewise dismisses. This prompted the mix of the two projects, moving the scout part to the mounted force variant of the XM723.
