Vz. 52 machine gun
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The vz. 52 is a Czechoslovak light machine gun developed after the Second World War for the Czechoslovak Armed Forces. Wikipedia
Barrel length: 583 mm (23.0 in)
Cartridge: 7.62×45mm (vz. 52), 7.62×39mm (vz. 52/57)
Muzzle velocity: 760 m/s
Used by: Czechoslovakia; Cuba; Biafra