ShKAS machine gun
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The ShKAS is a 7.62 mm calibre machine gun widely used by Soviet aircraft in the 1930s and during World War II. The ShKAS had the highest rate of fire of any aircraft machine gun in general service during WWII. It was designed by Boris Shpitalniy... Wikipedia
Designed: 1932
Barrel length: 605 mm (23.8 in) (wing and flexible); 750 mm (29.5 in) (synchronized); 675 mm (26.6 in) (1941 model)
Caliber: 7.62 mm
Cartridge: 7.62×54mmR
Feed system: Belt-fed
Muzzle velocity: 775–825 m/s (2,540–2,710 ft/s)
No. built: ~150,000