Mk 19 grenade launcher
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The Mk 19 grenade launcher is an American 40 mm belt-fed automatic grenade launcher that was first developed during the Vietnam War. Wikipedia
Designed: 1966
Action: API Blowback
Barrel length: 16.25 inches (413 mm)
Cartridge: 40×53 mm
Muzzle velocity: 750–790 feet per second (230–240 m/s) (average)
Rate of fire: 325-375rpm (cyclic); 40 rpm (sustained); 60 rpm (rapid)
Unit cost: $20,000