A Six Gun is a han held gun, or pistol, with a rotating cylinder that holds six bullets. The cylinder in a six gun is often called a 'wheel', and the six gun is itself often called a 'wheel gun'. The classic six gun was commonly carried by Old West cowboys and gunfighters. The most famous six gun in history is the Colt Single Action Army, or Peacemaker, in .45 Long Colt caliber. The six gun has many modern incarnations, such as the Ruger Vaquero and Beretta Stampede.