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Submachine Gun, Cal. .45, M3/M3A1 (1942) was nicknamed the "Grease Gun" because of its appearance. The M3 was a blow back submachine gun fielded in December 1942 by the United States Army during World War II. It could only be fired on fully-automatic. It used a .45 caliber cartridge in 30-round magazines. Its rate of fire was 350-450 rounds per minute. It had a length of 745mm, but due to its retracting stock, could be shortened to 570mm. The M3A1 was used during World War II and Korea. 679,200 were produced.

M3A1 with stock extended
image from Modern Firearms

See also