The Security Six family of double action revolvers was introduced by Sturm, Ruger & Company in 1971 and marketed to law enforcement agencies, the military, and civilian self-defensive markets. Due to the importance of the gun’s reliability when fielded in such arenas, the “Six Series” revolvers were robustly designed with large, heavy-duty parts to ensure durability and dependability.
The Security Six and its three basic variants were more or less identical in basic design, with the major differences between them being; the caliber, barrel length, and finishes offered. The main line of the Series Six, the Security Six, was available with three barrel lengths; 2.75, 4, or 6 inches. This fired either the .357 Magnum or .38 Special rounds and typically was manufactured with adjustable sights. The “Service Six”, also known as the “Police Service Six”, came with fixed sights, a square butt frame and were mostly cambered for the .357 Magnum; however, some police departments fielded models with .38 Special or 9mm Luger calibers. The “Speed Six” variant of the Six Series was offered in either a 4 or 6 inch barrel and differed from the other models by having a compact, round-butt grip frame and was offered in the .38 S&W caliber, popular in British Commonwealth counties. From its introduction until production ceased in 1988, Ruger produced over 1.5 million of the Six Series pistols and enjoyed profitable sales due to the pistols basic features, solid construction, and competitive pricing.