2A28 Grom

The 2A28 Grom is the main armament of the Soviet-designed 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.

2A28 Grom
Detailed view of a BMP-1 turret showing the 73 mm gun tube of the 2A28
TypeSmoothbore low-pressure cannon
Place of originSoviet Union
Service history
Used bySee BMP-1 Service History
WarsSee list of conflicts
Production history
DesignerKBP
DesignedEarly 1960s
ManufacturerKBP
Produced1966–present
Specifications
Mass115 kg
Length1195 mm
Width218 mm
Height322 mm

ShellPG-15V (HEAT), OG-15V (HE-FRAG), PG-15VN (HEAT-DP)
Caliber73 mm
Barrels1
Elevation-4° to +15° (aimed fire), +33° (maximum non-aimed)
Traverse20 °/s horizontal, 6 °/s vertical
Rate of fire8 rounds per minute
Muzzle velocity400 m/s at the muzzle, 665 m/s maximum (PG-15V); 290 m/s at the muzzle (OG-15V)
Maximum firing range1300 m (PG-15V), 4500 m (OG-15V)
Sights1PN22M, 1PN22M2
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