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U.S. Army service members setting up and firing a 40mm Mark-19 automatic grenade launcher aboard a vessel during a live-fire target practice training exercise at sea. The Mk 19 grenade launcher (Mark 19) is an American 40 mm belt-fed, air-cooled automatic grenade launcher. The Mk 19 can launch its grenade at a maximum distance of 2,212 meters (2,419 yd), though its effective range to a point target is about 1,500 meters. It fires 40 mm grenades at a cyclic rate of 325 to 375 rounds per minute, giving a pra
