The Peacemaker. US Army standard sidearm from 1873. Chambered in .45 Colt. Used in the Indian Wars, Spanish-American War, and Philippine-American War. Still in production today by Colt. Type: Revolver Action: Single-Action Caliber: 45 Colt Capacity: 6 Year introduced: 1873, USA Weight: 37 oz Overall length: 10.75" Status: Active Military use: Yes Intended use: Military, Collector, Hunting, Cowboy Action