The M2 4.2 inch Mortar was a U.S. rifled 4.2-inch (107 mm) mortar used during the Second World War and the Korean War. It entered service in 1943. It was nicknamed the "Goon Gun" (from its large bullet-shaped shells, monopod, and rifled bore - like a rifle for shooting Goons) or the "Four-Deuce" (from its bore size in inches).
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