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2A28 Grom
The 2A28 Grom is the main armament of the BMP-1 and BMD-1 infantry fighting vehicles. It is a 73 mm low pressure smoothbore semi-automatic gun with a wedge breechblock.
==Description==
The gun is relatively compact and weighs . In the BMP, the gun is brought to bear by an electric motor, with a manual mechanical backup. The maximum horizontal and vertical traverse speed with the electrical system is 20 °/s and 6 °/s respectively. Minimum horizontal and vertical direction rate is correspondingly 0.1 °/s and 0.07 °/s. The gun can be depressed and elevated between −4° and +33°, with aimed fire possible up to an elevation of +15°. The turret can traverse 360°.〔(MON )〕 Cyclic rate of fire is between 8 and 10 rounds per minute, with the gun returning to an elevation of +3° 30' to reload after each shot if the autoloader is used.
It is fed from a forty round mechanized conveyor double-row magazine located around the turret ring of the BMP. The gun is reloaded by the M3 electromechanical autoloader with ammunition conveyor, but can be reloaded by hand if necessary. The autoloader is not reliable; it can break down from vibration when the vehicle is moving at high speed over rough ground, and its operation is a danger to the gunner's fingers. Using the autoloader, the gun has a rate of fire of 6–8 rounds per minute, while a skilled gunner could easily achieve 10 rounds per minute. These drawbacks caused the autoloader to be removed in Ob'yekt 765Sp3, Finnish BMP-1 and Swedish Pbv 501. Some units removed the autoloader altogether when new vehicles were delivered, but the mechanized ammunition conveyor magazine was kept.
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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