AVS-36
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The AVS-36 was a Soviet automatic rifle which saw service in the early years of World War II. It was among the early selective fire infantry rifles formally adopted for military service. Wikipedia
Action: Gas-operated, vertically lifting locking block with secondary Flappers
Barrel length: 612 mm (24 in)
Designer: Sergei Simonov
Effective firing range: 600 m (2,000 ft)
Feed system: 15-round detachable box magazine
In service: 1936–1953
Rate of fire: 800 rounds/min