US Ordnance MK19 MOD 3 40mm grenade machine gun

US Ordnance produces the MK19 MOD 3 40mm grenade machine gun which is air cooled, blow back operated, automatic fire, belt-fed weapon that has an angle of fire between 70 degrees elevation and 70 degrees depression. The MK19 MOD 3 is not designed to cook off because it fires from an open bolt and has a low barrel temperature during rapid fire. It is capable of firing various rounds, such as the M430A1 High Explosive Dual Purpose (HEDP) grenades 40mm grenades, at a cyclic rate of 325 to 375 rounds per minute.