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 breech block. Development of the 2A28 Grom was directly linked to that of the SPG-9 recoilless gun; both fired projectiles similar to rocket-propelled grenades.Development history
During the early 1960s, the Soviet Armed Forces issued a requirement for a new infantry transporter that was highly mobile, sufficiently armed to destroy comparable Western vehicles such as the M59 and the Schützenpanzer Lang HS.30, and allowed embarked infantrymen to fight from within its crew compartment. This concept evolved into the BMP-1.The BMP was initially to be armed with a 23mm autocannon, a choice directly inspired by the success of the West German HS.30. However, the Soviet government had invested heavily in the development of anti-tank guided missile (ATGM) systems and discussion soon shifted to arming the
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