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M4 cannon
The 37 mm Automatic Gun, M4, known as the T9 during development, was a 37 mm (1.46 in) recoil operated autocannon designed by Browning Arms Company. The weapon, which was built by Colt, entered service in 1942. It was used in the Bell P-39 Airacobra and P-63 Kingcobra.
==Design==
Designed primarily as an anti-aircraft weapon, the gun had a muzzle velocity of and a cyclic rate of 150 rounds per minute. It was normally loaded with high-explosive shells, but could also be loaded with the M80 armor-piercing shell which could penetrate 1 in (25 mm) of armor plate at . It was magazine-fed and could be fired manually or by remote control through a solenoid mounted on the rear of the gun.
Recoil and counter-recoil were controlled hydraulically by means of a piston and spring combination connected to the recoiling mechanism and operating in an oil-filled recuperator cylinder mounted to the stationary trunnion block assembly. The recoiling mechanism of the gun included the tube and tube extension, recuperator piston and piston rod, lock frame assembly, driving spring assemblies, and the breechblock assembly. The nonrecoiling parts included the trunnion block group, the feed box and feeding mechanism, the recuperator cylinder and bushing, the back plate group, and the manual charger assembly.
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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