Mk 19 Mod 3

The Mk 19 grenade launcher (pronounced Mark 19) is an American 40 mm belt-fed automatic grenade launcher that was first developed during the Vietnam War. The first model (Mod 0) in 1966 was determined to be unreliable and unsafe, but a total of six Mod 1 launchers were successfully tested on U.S. Navy riverine patrol craft in the Mekong Delta in 1972. The Navy made further improvements to the weapon, resulting in the Mod 3 in 1976. The Mod 3 was adopted by the U.S. Army in 1983 and remained in service in 2017.

While the Mk 19 typically fires 40x53mm grenades, it can fire 40x46mm grenades used by other launchers, but they must be individually loaded. The action cannot fit the M1029 Crowd Dispersal Munition or M1006 sponge round.