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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