Influenced by the German MP 40 and the British Sten, the .45-caliber M3 "Grease Gun" served as the primary U.S. submachine gun for almost a half century. Designed to replace the expensive Thompson SMG, the M3 was issued to airborne troops thanks to its compact design with sliding wire stock, also being favored by armored crews right up to 1991's Operation Desert Storm.
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