2A28 Grom

2A28 Grom
Detailed view of a BMP-1 turret showing the 73 mm gun tube of the 2A28
Type	Smoothbore low-pressure cannon
Place of origin	Soviet Union
Service history
Used by	See BMP-1 Service History
Wars	See list of conflicts
Production history
Designer	KBP
Designed	Early 1960s
Manufacturer	KBP
Produced	1966–present
Specifications
Mass	115 kg
Length	1195 mm
Width	218 mm
Height	322 mm
Shell	PG-15V (HEAT), OG-15V (HE-FRAG), PG-15VN (HEAT-DP)[citation needed]
Caliber	73 mm
Barrels	1
Elevation	-4° to +15° (aimed fire), +33° (maximum non-aimed)[citation needed]
Traverse	20 °/s horizontal, 6 °/s vertical
Rate of fire	8 rounds per minute[citation needed]
Muzzle velocity	400 m/s at the muzzle, 665 m/s maximum (PG-15V); 290 m/s at the muzzle (OG-15V)[citation needed]
Maximum firing range	1300 m (PG-15V), 4500 m (OG-15V)[citation needed]
Sights	1PN22M, 1PN22M2[citation needed]

The 2A28 Grom also known as KBP 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.^[1] Development of the 2A28 Grom was directly linked to that of the SPG-9 recoilless gun; both fired projectiles similar to rocket-propelled grenades.^[2]