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| M3 "Grease Gun" | |
|---|---|
| Name | M3 "Grease Gun" |
| Caption | M3 "Grease Gun" with magazine |
| Origin | United States |
| Type | Submachine gun |
| Service | 1943–present |
| Used by | United States, United Kingdom, France, Israel |
| Wars | World War II, Korean War, Vietnam War, Six-Day War |
| Design date | 1942–1943 |
| Manufacturer | General Motors Guide Lamp Division |
| Production date | 1943–1957 |
| Number | ~600,000 |
| Cartridge | .45 ACP |
| Action | Blowback, closed bolt |
| Rate | ~450 rounds/min |
| Feed | 30-round detachable box magazine |
| Sights | Iron sights |
M3 "Grease Gun" The M3 "Grease Gun" is an American .45 ACP submachine gun introduced during World War II to supplement the Thompson submachine gun for armored vehicle crews, paratroopers, and support units. Designed for low production cost and simplified maintenance, it served through the Korean War and into the Vietnam War era, influencing postwar small arms design and NATO armament debates. Its utilitarian appearance and widespread service made it a recognizable improvised-tool icon in mid-20th century conflicts.
Developed in 1942–1943 by engineers at the General Motors Guide Lamp Division under wartime procurement directives from the United States Army Ordnance Department, the design prioritized stamped sheet metal construction, simplified machining, and use of existing .45 ACP ammunition and M1911 pistol magazines. Influenced by lessons from the Thompson submachine gun and the compact requirements of armored warfare and paratrooper operations during North African campaign and Sicilian campaign, the weapon employed a telescoping wire stock, a simple blowback mechanism, and a vertical magazine well to reduce length and production time. The design process involved coordination with Springfield Armory standards and evaluations against competing proposals from firms linked to Colt's Manufacturing Company and Browning Arms Company.
The weapon fired the .45 ACP cartridge from a 30-round detachable box magazine at an approximate cyclic rate of 400–450 rounds per minute, with an overall length suitable for vehicle stowage comparable to contemporary compact designs fielded by British Army and Soviet Red Army units. Constructed mainly from stamped steel and simple components, it used a blowback, closed-bolt action similar in principle to designs evaluated by United States Navy and United States Marine Corps ordnance officers during the Pacific War. Iron sights matched doctrines influenced by engagement studies from European Theater of Operations and Pacific Theater infantry encounters. Weight, balance, and ergonomics were assessed alongside contemporaneous small arms such as the Sten gun and MP40.
Issued initially to armored vehicle crews, support personnel, and rear-area units during World War II, the weapon supplemented Thompson submachine gun allocations as production constraints eased. Postwar inventories saw distribution to National Guard units, law enforcement agencies evaluated by FBI and municipal police departments, and foreign military assistance programs coordinated through Marshall Plan-era transfers. The M3 continued service into the Korean War with United States forces and was encountered in French Indochina and later in Vietnam through surplus and transfer programs. Cold War logistics and surplus sales resulted in presence across NATO and nonaligned militaries, affecting armament patterns studied by analysts at institutions like the Rand Corporation.
Original production models were followed by simplified and upgraded variants to address feeding and handling: an improved safety and bolt design, a shortened wire stock, and magazine modifications paralleling developments seen in Colt SMG experiments and postwar redesigns by other manufacturers. International modifications included locally produced conversions and rechamberings analogous to modifications performed on Thompson submachine gun units by allied arsenals during occupation and assistance programs. Specialized variants were trialed for vehicle mounting and airborne packing requirements similar to adaptations applied to the Sten gun and MP40 in various theaters.
In combat, the weapon's compactness, low production cost, and .45 ACP stopping power made it favorable for close-quarters engagements described in after-action reports from Normandy campaign airborne operations and Pacific island fights. Its performance was compared in ordnance evaluations with the Thompson submachine gun, the Sten gun, and later with emerging assault rifle concepts promoted by proponents at Fort Benning and Aberdeen Proving Ground. Criticisms centered on magazine reliability, ergonomics, and limited effective range versus intermediate-cartridge rifles fielded during the Korean War and the rise of assault rifles in the Vietnam War era.
Beyond primary use by the United States Army and United States Marine Corps, the weapon was supplied to the United Kingdom under lend-lease arrangements, issued to Free French forces and later to French units in Indochina, transferred to Middle Eastern recipients including Israel during early statehood conflicts, and sold or gifted to numerous other countries via surplus programs coordinated through US Department of State and allied procurement channels. Its distribution mirrors mid-20th century American military aid patterns affecting recipients ranging from NATO members to newly independent states engaging in regional conflicts.
Owing to its austere industrial design and association with mid-century conflicts, the weapon appears in cinematic depictions of World War II and Korean War scenes and features in collections at institutions such as the Smithsonian Institution and military museums documenting small arms evolution. Its influence on postwar submachine gun doctrine and inexpensive mass-production approaches informed debates among designers and procurement officials at organizations like Sandia National Laboratories and defense think tanks, contributing to the transition toward lighter, higher-rate-of-fire infantry weapons that shaped late 20th-century small arms development.
Category:Submachine guns Category:.45 ACP firearms Category:Weapons of the United States