The Canadian Encyclopedia — neutral, cited, updated
July 26, 2026Sources cited
Canadianwire.
Canada’s encyclopedia & explainer
Home›Crime & Justice›Firearm›M1911
Crime & Justice • Firearm

M1911

The M1911 is a single-action, recoil-operated semi-automatic pistol originally developed by John Moses Browning and produced by Colt.

By Ethan Anderson| Reviewed by Olivia Bennett, Standards & Fact-Checking Lead| Updated July 26, 2026|2 min read| Fact-checked

The M1911 is a single-action, recoil-operated semi-automatic pistol originally developed by John Moses Browning and produced by Colt. Chambered primarily in .45 ACP, it was adopted by the United States military in 1911 and remained a standard sidearm for decades. The design has also inspired many later variants and clones.

Design and operation

The M1911 is a short-recoil operated, single-action semi-automatic pistol. It is most closely associated with the .45 ACP cartridge and a single-stack magazine layout.

Military service

The pistol was adopted by the United States Army in 1911 and later used across the U.S. armed forces. It saw major use in World War I, World War II, the Korean War, and the Vietnam War.

Variants and influence

The original design led to the M1911A1 and many later commercial and military derivatives. The 1911 pattern became one of the most copied handgun designs in firearms history.

Later use

Although replaced as the standard U.S. military sidearm, the M1911 continues to be used and produced in various forms. It remains popular for civilian shooting, competition, and some specialized service roles.

Key facts

  • The M1911 is one of the best-known handgun designs of the 20th century.
  • It was designed for the .45 ACP cartridge and uses a single-action trigger mechanism.
  • The pistol was adopted by the U.S. military in 1911 and saw extensive service in major 20th-century conflicts.
  • Many derivative designs, commercial variants, and copies have been produced.
  • The platform remains in civilian, law-enforcement, and specialized military use.
🍁
Canadian context

The M1911 is relevant to Canadian readers mainly as a historically important firearm design that influenced global handgun development and appears in Canadian collecting, sport shooting, and firearms-history discussions.

Frequently asked questions

What is the M1911?
The M1911 is a U.S.-designed semi-automatic pistol developed by John Moses Browning and first adopted in 1911.
What cartridge does the M1911 use?
It was originally chambered primarily for the .45 ACP cartridge.
Who designed the M1911?
John Moses Browning designed the pistol.
Was the M1911 used by the U.S. military?
Yes. It served as a standard U.S. military sidearm from 1911 until the mid-1980s, depending on the source.
Is the M1911 still used today?
Yes. It remains in use in civilian markets and in some law-enforcement and specialized military contexts.

References

  1. Wikipedia — https://en.wikipedia.org/wiki/M1911_pistol
    Supports: Basic identification as a Colt M1911 / 1911 semi-automatic pistol chambered in .45 ACP.
  2. WeaponSystems.net — https://weaponsystems.net/system/291-Colt+M1911
    Supports: Designer, operation, cartridge, military service, and continued use.
  3. ArmyHistory.org — https://armyhistory.org/m1911-45-caliber-pistol/
    Supports: U.S. Army adoption in 1911 and historical service context.
  4. Military Factory — https://www.militaryfactory.com/smallarms/detail.php?smallarms_id=12
    Supports: Historical importance and broad 20th-century service reputation.