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[Simfphys-Gred] BMP-1AM

The core change that differentiates the BMP-1AM from a regular BMP-1 is a replacement of the BMP-1’s one-man turret fitted with an autoloader and armed with the 73 mm Grom by the weapon station featured in the Russian BTR-82A armored personnel carrier – itself an improved version of the BTR-80A’s weapon station. This station is remotely controlled by the gunner sitting in the hull of the vehicle.

The main armament of this new turret or ‘unified combat module’ is the 30 mm 2A72 autocannon (a modified 2A42 autocannon). The cannon fires 30×165 mm ammunition. and has a rate of fire of 350 to 400 rpm. The gun is belt-fed, and overall remarkably light, weighing only 84 kg. barrel length of 2,416 mm, takes a significant part of the weapon’s weight, at 36 kg, and is typically thicker and more durable than most barrels for 30 mm autocannons.

A number of 30×165 mm shells are available for the 2A72. For use against light fortifications, infantry, soft-skinned vehicles, and other unarmored targets, the 2A72 can fire the 3UOF8 High-Explosive Incendiary (HE-I) shells. This shell has an explosive filling of 49 grams of A-IX-2, the standard Soviet explosive autocannon shell formula since 1943. The overall mass of the projectile is 390 g, and that of the whole cartridge 842 g. In high-explosive belts, it is complemented by the 3UOR6. This shell forsakes most of the explosive charge, with only 11.5 g remaining, to mount a very large tracer. Fired at the same muzzle velocity of 980 m/s, it is used for fire correction purposes, though over large distances, the trajectory of the two shells may begin to differ. With a fuse lasting 9 to 14 seconds, the explosive shells will generally detonate after about 4 kilometers if they have not met a target, though autocannons are typically used effectively at much closer ranges. The rate of tracer to high-explosive rounds in a 30 mm belt tends to be of 1:4.

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