This weapon was used by U.S. forces in the various wars against Native Americans. Key point: This weapon was modern and also reliable. Here is how it was used to extend U.S. dominance towards the Pacific coast. One of the most famous handguns of all time is the Colt Single Action Army revolver. Also known as the Peacemaker, Frontier Six-Shooter and the M1873, the Single Action Army is also a staple of Hollywood films, appearing in virtually every cowboy and western film ever made. The revolver was was used by soldiers and civilians alike, and is still in production more than 140 years after it entered U.S. Army service.