M2 4.2-inch mortar

M2 4.2-inch mortar
Type	Mortar
Place of origin	United States
Service history
In service	1943–1974 (United States) 1943–present
Used by	U.S. Army U.S. Marine Corps
Wars	World War II Korean War First Indochina War Vietnam War Portuguese Colonial War
Production history
Designer	U.S. Chemical Warfare Service
Specifications
Mass	151 kg (332.89 lbs)
Length	1.22 m (4 ft)
Barrel length	1 m (3 ft 3 in)
Shell	11–13 kg (24 lb 4 oz – 28 lb 11 oz)[1]
Caliber	107 mm (4.2 in)
Rate of fire	5 rpm for 20 minutes 1 rpm indefinitely
Muzzle velocity	250–256 m/s (820–840 ft/s)
Effective firing range	515 m (563.21 yd)
Maximum firing range	4.4 km (2.7 mi)

The M2 4.2-inch mortar was a U.S. rifled 4.2-inch (107 mm) mortar used during the Second World War, the Korean War, and the Vietnam War. It entered service in 1943. It was nicknamed the "Goon Gun" (from its large bullet-shaped shells, monopod, and rifled bore) or the "Four-Deuce" (from its bore size in inches). In 1951, it began to be phased out in favor of the M30 mortar of the same caliber.