The Gryazev-Shipunov GSh-30-1 (the actual Russian designation is GSh-301; also known by the GRAU index designation 9A-4071K) is a 30 mm cannon designed for use on Soviet and later Russian military aircraft, entering service in the early 1980s. Its current manufacturer is the Russian company Izhmash JSC.
The GSh-301 is a single-barreled, gas-operated cannon weighing 46 kg (101 lb). Unlike many postwar cannons, it is linear action, not a revolver cannon or Gatling gun, with the Russians feeling that the reduction in rate of fire is compensated by reduced mass and bulk.
The GSh-301 has a rate of fire of 1,800 rounds per minute, customarily limited to 1,500 rounds per minute to reduce barrel wear. Despite that, its barrel life is quite short: 2,000 rounds. When firing a continuous burst of 100–150 rounds, the barrel is put under so much stress that it has to be replaced. The gun uses an evaporation cooling system to prevent the detonation of a high explosive round inside a heated barrel. This cooling system consists of a cylindrical water tank around the rear end of the barrel. The GSh-301 is equipped with a unique pyrotechnic mechanism to clear misfires: a small pyrotechnic cartridge is located to the left of the 30mm cartridge chamber. This pyrotechnic cartridge fires a small steel bolt through the side wall of the 30mm cartridge. The hot propellant gases following the bolt into the dud 30mm round ignite the powder charge of that round and firing continues.
The manufacturer (Izhmash Arms Plant, Izhevsk) says the gun's maximum effective range against aerial targets is 1,200 to 1,800 m (3,900 to 5,900 ft).
In combination with a laser rangefinding/targeting system, it is reported to be extremely accurate as well as powerful, capable of destroying a target with as few as three to five rounds. It has been deployed on several different types of fighter aircraft:
Su-27, Su-30, Su-33 and Su-35: 1 GSh-301 in starboard wing root (150 rds. ammunition load)
Su-34: 1 GSh-301 in starboard wing root (180 rds. ammunition load)
MiG-29: 1 GSh-301 in port wing root (150 rds. ammunition load)
Yak-141: 1 GSh-301 on the belly (150 rds. ammunition load)
9A4273 gun pod: 1 GSh-301 flexibly mounted, pod weight 480kg (150 rds. ammunition load)
SCREENSHOOT
| Type | Automatic cannon |
|---|---|
| Place of origin |  Soviet Union |
| Service history | |
| In service | 1980–present |
| Production history | |
| Designer | V. Gryazev, A. Shipunov |
| Designed | 1977 |
| Manufacturer | KBP Instrument Design Bureau |
| Specifications | |
| Weight | 46 kg |
| Length | 1978 mm |
| Barrel length | 1500 mm |
| Width | 156 mm |
| Height | 185 mm |
| | |
| Cartridge | 30×165mm |
| Caliber | 30mm |
| Barrels | 1 |
| Action | Short recoil operated |
| Rate of fire | 1500–1800 rounds/min |
| Muzzle velocity | 860 m/s |
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