The M1 Thompson: More Than a Gangster Prop
The Thompson submachine gun was conceived by John T. Thompson, a lieutenant colonel who wanted a weapon that could clear trenches during World War I. He hired George Downing and Theodore Huckleberry to build it. The result fired the .45 ACP cartridge from an open bolt, used a rotating bolt design, and was expensive to make. That last point matters more than most people realize. Early Thompsons cost around $225 each in 1921 dollars, which is roughly $3,800 today. That price tag shaped everything about the gun's history. It saw action in World War I but arrived too late to matter in significant numbers. The interwar period is where the story gets interesting. Law enforcement agencies and criminal organizations both bought them in substantial quantities. The FBI acquired Thompsons in the 1930s, and so did various syndicate operations during Prohibition. The gun became culturally associated with that era because it was one of the few fully automatic weapons available to anyone who could afford it. But the association oversimplifies what the weapon actually was and what it was used for.
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The original design had a receiver machined from a solid block of steel. That was wasteful even by 1920s standards. Production continued through the 1930s for military contracts, police departments, and private buyers. By the time the United States entered World War II, the military had ordered tens of thousands of them, but the cost and manufacturing complexity were becoming impossible to sustain at scale. The answer was the M1, introduced in 1942, which simplified the receiver, removed the bayonet lug, and cut production time significantly. The M1A1 followed shortly after with a side-folding stock and additional cost reductions. Here's something most people don't understand about the Thompson: it was not particularly accurate in automatic fire, and the open-bolt design contributed to that. When you pulled the trigger, the bolt was already back. It had to travel forward to chamber a round before firing. That delay, combined with the heavy recoil impulse of the .45 ACP, made burst control difficult. I've handled original M1 versions at a shooting range, and the trigger pull on the later variants was noticeably rougher than on the prewar models. The sear surfaces on worn examples can feel gritty, and the return spring assembly is straightforward to disassemble but reassembly requires patience because the components are heavy and nothing is spring-loaded into place neatly. The Thompson's actual combat record is more nuanced than the myth suggests. In the Pacific theater, it was valued by Marine units for close-quarters combat in jungle environments. European theaters saw less consistent use, and some commanders complained about the weight and the high ammunition consumption rate. A Thompson firing full automatic could empty its 20-round magazine in about three seconds. That is a logistical problem on a sustained engagement.
Production numbers tell the real story. Approximately 1.5 million Thompsons of all variants were manufactured between 1921 and 1945. The majority came from Auto-Ordnance, but licensed production at Springfield Armory and other facilities increased output during the war years. Postwar, the gun saw limited service in Korea and was supplied to various allied nations. Some were converted to fire the 9mm Parabellum for European markets, though those variants are less common and harder to authenticate today. If you are looking at collecting or studying an original Thompson, the serial number range is your first checkpoint. Numbers below roughly 30,000 are prewar models with the more elaborate furniture and the barrel shroud with cooling holes. Later wartime examples have simplified woodwork,Stamped receiver markings, and often missing original sights replaced with simpler apertures. Fake or mixed-parts Thompsons circulate regularly, so verify every component against documented specifications for your serial number range before making any purchase. The NFA trust paperwork for a Thompson transfer runs about $200 in federal tax stamp fees and typically takes six to eight months through current ATF processing times. Plan accordingly.
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