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The M1911 pistol was a series of semi automatic pistols made by Colt Firearms for the United States armed forces. The M1911 pistol and its variants saw extensive service with the US Armed Forces from 1911 to at least the late 20th century.
The inhabitants of the planet Sigma Iotia II developed their own copy of the M1911 along with other 1920's-era Earth firearms when they based their culture off descriptions of the era's Chicago gangs. (TOS: "A Piece of the Action")