Gryazev-Shipunov GSh-23
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The Gryazev-Shipunov GSh-23 is a twin-barreled 23 mm autocannon developed in the Soviet Union, primarily for military aircraft use. It entered service in 1965, replacing the earlier Nudelman-Rikhter NR-23 and Rikhter R-23. Wikipedia
Barrel length: 1,000 mm (3 ft 3 in)
Caliber: 23mm
Cartridge: 23×115 mm
Manufacturer: KBP Instrument Design Bureau
Mass: GSh-23: 49.2 kg (108 lb); GSh-23L: 50 kg (110 lb)
Rate of fire: 3,400–3,600 rounds/min (alleged)
Variants: GSh-23L