38 S&W and 9x19mm Parabellum (9mm Luger). Featuring six- round cylinders, the Security Six series represented one of the first modern revolver designs to feature the safer transfer-bar based lockwork, and was chambered for a variety of centerfire ammunition cartridges including. Medium- framed in size, these revolvers were initially manufactured in a blued carbon steel finish in 1975 stainless steel versions of all models were added to the lineup. The Security Six and its variants were more or less identical in basic design, with the differences between the various models being expressed by the exact options and features available. The Ruger GP-100 replaced the Security Six in the Ruger product line.

While Ruger's Security Six line has been out of production since 1988, a total of over 1.5 million revolvers were produced and they remain well-liked and respected, as well as highly sought after in the second-hand market. The Security Six and its derivatives also became the standard issue service weapons of a large number of police departments, in addition many were exported overseas. Various models were issued by US government agencies as diverse as the former Immigration and Naturalization Service, the Postal Service, Border Patrol, and numerous police agencies. The 'six series' line enjoyed sales success because of their basic features, solid construction, and competitive pricing. As with all Ruger firearms, the Security Six revolvers were robustly designed with large, heavy-duty parts for durability and to allow for investment casting. Ruger used investment casting for most parts in an effort to hold down production costs.

The corporation's earlier designs had been Colt Peacemaker style single action revolvers. The introduction of the Security Six and its variants marked Sturm Ruger's first attempt to enter the double action revolver market.

Ruger police six review