The Colt 1991 is a usa-made semi-automatic pistol chambered in .45 ACP, introduced in 1991. Primary use: Carry, Range/Target. Type: Pistol Action: Semi-Automatic Caliber: .45 ACP Capacity: 7 Year introduced: 1991, USA Weight: 38 oz Overall length: 8.5" Status: Active Intended use: Carry, Range/Target