Thompson M1A1 shooting in Prague

.45 ACP

The Thompson M1A1: A Legend in Firearms History

Few firearms in history have achieved the iconic status and widespread recognition that the Thompson M1A1 submachine gun has. Known as the "Tommy Gun" or simply "Tommy," this firearm has left an indelible mark on popular culture, thanks to its appearance in countless movies, television shows, and video games. Beyond its Hollywood fame, the Thompson M1A1 boasts a rich production and service history, a unique design, and several variants that catered to different military and civilian needs.

Production and Service History

The Thompson submachine gun was born out of necessity during the tumultuous years of the early 20th century. Designed by John T. Thompson in the aftermath of World War I, the gun was intended to provide American troops with a lightweight, compact, and reliable firearm capable of delivering rapid fire. Initially, the gun was envisioned as a trench-clearing weapon, but its design soon evolved to meet the changing demands of modern warfare.

Origins and Early Production: The first prototypes of the Thompson submachine gun were developed in 1917, and the weapon saw limited use during World War I. It was formally adopted by the U.S. Army in 1928 as the M1928, featuring a distinctive drum magazine and a forward pistol grip. However, the M1928's complex design and high production costs limited its widespread adoption.

The M1 and M1A1 Variants: In response to feedback from the military and law enforcement agencies, the M1 variant was introduced in 1942. This version, later known as the M1A1, featured simplified construction, a box magazine, and the elimination of the drum magazine. These changes made the M1A1 more cost-effective and easier to produce, making it the most iconic version of the Thompson.

Service in World War II: The Thompson M1A1 became widely recognized during World War II, where it was issued to American and Allied troops. It gained popularity due to its reliability and firepower, earning the nickname "Tommy Gun." Soldiers and Marines found it invaluable in close-quarters combat, and it became a symbol of American firepower during the war.


The Thompson M1A1's design is distinctive and easily recognizable, contributing to its enduring appeal. Here are some key design elements:

Construction: The Thompson M1A1 is a blowback-operated, selective-fire submachine gun. It is primarily made of steel, which gives it a sturdy and robust feel. Its barrel is relatively short, making it a compact weapon, ideal for use in confined spaces.

Fire Selector: The M1A1 had a fire selector that allowed it to operate in both semi-automatic and fully automatic modes, providing flexibility in combat situations. Soldiers could switch between these modes based on the engagement range and desired rate of fire.

Magazine: One of the most distinctive features of the M1A1 was its detachable box magazine. It typically held 20 or 30 rounds of .45 ACP ammunition, providing a generous amount of firepower. The absence of the drum magazine in the M1A1 made it lighter and more practical for soldiers in the field.


Over the years, several variants of the Thompson submachine gun have been produced to meet various military and civilian requirements. Here are some notable ones:

M1921: The M1921 was the original Thompson submachine gun, featuring a heavy finned barrel and the iconic drum magazine. It had a distinctive appearance and was known for its high rate of fire.

M1928: The M1928, an evolution of the M1921, included refinements such as a Cutts compensator and cooling fins on the barrel. However, its complexity and cost led to limited adoption.

M1A1 Paratrooper: The M1A1 Paratrooper variant featured a folding stock, making it more compact and easier to transport by airborne troops. This variant was favored by paratroopers during World War II.

M1A1 with Cutts Compensator: Some M1A1s were equipped with the Cutts compensator, a muzzle brake that reduced recoil and improved control during automatic fire.

Interesting Facts

Gangsters' Weapon of Choice: During the Prohibition era in the United States, the Thompson submachine gun gained notoriety as the weapon of choice for gangsters and criminals. Its use in various criminal activities earned it the nickname "Chicago Typewriter."

International Adoption: Besides its service in the United States, the Thompson M1A1 was used by many other nations during and after World War II. It found its way into the hands of soldiers and resistance fighters in Europe, Asia, and beyond.

The "Broomhandle" Grip: The forward pistol grip of the early Thompson models, including the M1921 and M1928, earned them the nickname "Broomhandle" due to its resemblance to the handle of a broom.

Film and Pop Culture: The Thompson M1A1's distinctive appearance has made it a popular choice in films, TV shows, and video games. It has appeared in classics like "The Untouchables" and "Bonnie and Clyde" and continues to be featured in contemporary media.


The Thompson M1A1 submachine gun is a true legend in the world of firearms. Its production and service history, unique design, and memorable variants have solidified its place in history. Beyond its military use, its cultural impact and appearances in entertainment have made it an enduring symbol of American firepower. Despite the passage of time, the Tommy Gun remains an iconic piece of weaponry, reminding us of a bygone era of innovation and conflict.


  • Thompson M1A1 - Name
  • submachine gun - Type
  • Auto-Ordnance Company, Colt - Manufacturer
  • M1A1 - Model
  • .45 ACP - Caliber
  • blowback - Action type
  • John T. Thompson - Designer
  • 1917-1920 - Designed
  • 1921 - In service
  • 4.5 kg - Weight
  • 813 mm - Length
  • 75-150 m - Firing range

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