The Colt M45A1 is a usa-made semi-automatic pistol chambered in .45 ACP, introduced in 2012. Primary use: Military, Tactical. Type: Pistol Action: Semi-Automatic Caliber: .45 ACP Capacity: 7 Year introduced: 2012, USA Weight: 86 oz Overall length: 39.5" Status: Active Military use: Yes Intended use: Military, Tactical