McGill's pistol, in almost all of the episodes, is a Smith & Wesson 39. The 39 was designed in hopes of being a replacement for the U.S. Army's Colt 1911 during Service Pistol Trials held in 1954. The S&W 39 is a 9mm double action semi-automatic, while the Colt 1911 is a .45 single action semi-automatic. While the Army decided to stick with the Colt, some U.S. Special Forces in the Vietnam War carried the S&W 39. So conceivably McGill may have trained with the weapon and been issued one by "American Intelligence" before he was scapegoated out.