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The M3 is an American .45-caliber submachine gun adopted by the U.S. Army on 12 December 1942, as the United States Submachine Gun, Cal. .45, M3. The M3 was chambered for the same .45 ACP round fired by the Thompson submachine gun, but was cheaper to mass produce and lighter, at the expense of accuracy. The M3 was commonly referred to as the "Grease Gun" or simply "the Greaser", owing to its visual similarity to a grease gun, a mechanic's tool.
The M3 was intended as a replacement for the Thompson submachine gun, and began to enter frontline service by mid-1944. By late 1944, the M3A1 variant was introduced, which also saw use in the Korean War and later conflicts.
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