DS-39
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DS-39 was a Soviet medium machine gun, designed by Vasily Degtyaryov, that was used during the Second World War. The work on the gun's design began in 1930, and it was accepted by the Red Army in September, 1939. Wikipedia
Barrel length: 720 mm (2 ft 4 in)
Caliber: 7.62 mm (0.300 in)
Rate of fire: 600 to 1200 round/min