The Colt M1911A1 pistol is a single action, semi-automatic sidearm used by the Tau'ri. Lt. Hammond carried a M1911A1 as a sidearm when he encountered SG-1 in 1969. (SG1: "1969") Since the Atlantis expedition's second year of operation, Lt. Col. John Sheppard has replaced the standard M9 Beretta pistol with an M1911A1 as his preferred sidearm, possibly due to its greater stopping power. The custom model Sheppard carries appears to have adjustable sights fitted. The particular variant he uses is the Para Ordnance P14 high-capacity .45 ACP. (SGA: "Instinct", "Irresponsible")