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RARDEN
The L21A1 RARDEN is a British 30mm autocannon used as a combat vehicle weapon. The name is a contraction of the Royal Armament, Research and Development Establishment and Enfield. The Royal Armament Research and Development Establishment (RARDE) and the Royal Small Arms Factory (RSAF), Enfield, at the time, were both part of the Ministry of Defence.
==Design==
The weapon uses a long recoil system of operation, for minimum recoil forces on the mounting and vehicle. Spent cases are ejected forwards. The weapon was also designed for minimum inboard length, allowing for more space in the turret or a smaller turret overall. Another feature is that no gun gas escapes into the turret.
The cartridge case used is 170mm in length,〔(【引用サイトリンク】title=Jane's Ammunition Handbook: 30 x 170 Rarden gun ammunition, Cannon - 20 to 30 mm cannon )〕 and is based on the Hispano-Suiza 831-L round. Unlike the belt-fed systems on most vehicle weapons, Rarden is loaded manually with three-round clips.〔 This limits its capacity to fire in automatic mode to 6 rounds. The Rarden gun does not require an external power source and can therefore remain in action even if the vehicle is disabled.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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