The Colt Single Action Army — also known as the Model P,Peacemaker, M1873, Single Action Army, SAA, and Colt 45 — is a single action revolver with a revolving cylinder holding six metallic cartridges. It was designed for the U.S. government service revolver trials of 1872 by Colt's Patent Firearms Manufacturing Company, today Colt's Manufacturing Company, and was adopted as the standard military service revolver until 1892.
The Colt Single Action Army has been offered in over 30 different calibers and various barrel lengths. Its overall appearance has remained consistent since 1873. Colt has discontinued its production twice, but brought it back due to popular demand. The revolver was popular with ranchers, lawmen, and outlaws alike, but current models are mostly bought by collectors and reenactors. Its design has influenced the production of numerous other models from other companies.
This gun is Rusty's secondary weapon as seen when he doesn't have his P38 or M1900 he uses this.