Nudelman-Suranov NS-45
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The Nudelman-Suranov NS-45 was an enlarged version of the Soviet Nudelman-Suranov NS-37 aircraft autocannon. It was evaluated for service on 44 Yakovlev Yak-9K aircraft during World War II, but proved to stress the airframes too much. Wikipedia
Barrel length: 230.5 centimetres (7.56 ft)
No. built: ~200
Rate of fire: 260–280 rpm
Shell: 45×186 mm