| Is Ranged: | yes |
| Gryazev-Shipunov GSh-6-23 | |
| Origin: | Soviet Union |
| Type: | Rotary cannon |
| Designer: | Vassily P. Gryazev and Arkady G. Shipunov |
| Manufacturer: | KBP Instrument Design Bureau Tula |
| Service: | 1975-present |
| Cartridge: | 23×115mm AM-23 |
| Caliber: | 23 mm |
| Action: | Gas-operated |
| Rate: | 6,000–8,000 (standard).[1] 9,000–10,000 rpm (alleged maximum).[2] |
| Velocity: | 715 m/s (2345 ft/s) |
| Weight: | 73–76 kg (161–167 lb) |
| Length: | 1.4 m (4 ft 7 in) |
| Part Length: | 1 m (3 ft 34 in) |
| Height: | 18 cm (7 in) |
| Barrels: | 6 |
| Feed: | Belt or linkless feed system |
The Gryazev-Shipunov GSh-6-23 (Russian: Грязев-Шипунов ГШ-6-23) (GRAU designation: 9A-620 for GSh-6-23, 9A-768 for GSh-6-23M modernized variant) is a six-barreled 23 mm rotary cannon used by some modern Soviet/Russian military aircraft.[3]
The GSh-6-23 differs from most American multi-barreled aircraft cannon in that it is gas-operated, rather than externally powered via an electric, hydraulic, or pneumatic system.The GSh-6-23 uses the 23×115 Russian AM-23 round, fed via linked cartridge belt or a linkless feed system.[4] The linkless system, adopted after numerous problems and failures with the belt feed, is limited.[5] Fire control is electrical, using a 27 V DC system. The cannon has 10 pyrotechnic cocking charges, similar to those used in European gas-operated revolver cannon such as the DEFA 554 or Mauser BK-27.
The rapid rate of fire exhausts ammunition quickly: the Mikoyan MiG-31 aircraft, for example, with 260 rounds of ammunition (800 rounds maximum), would empty its ammunition tank in less than two seconds.
GSh-6-23M has the highest rate of fire out of any autocannon so far.[6]
The GSh-6-23 is used by the Sukhoi Su-24 attack aircraft, the MiG-31 interceptor aircraft, and the now-obsolete Sukhoi Su-15 among others. However, after two Su-24s were lost because of premature shell detonation in 1983, and because of some other problems with gun usage (such as system failures), usage of the GSh-6-23 was stopped by a decision of the Soviet Air Force Command. At present all aircraft in the Russian Aerospace Forces are flying with fully operational guns.[7]
It is also used in the SPPU-6 gun pod, which can traverse to −45° elevation, and ±45° azimuth.[8]