Ruger Security-Six
American revolver

The Ruger Security-Six and its variants, the Service-Six and Speed-Six are a product line of double-action revolvers introduced in 1972 and manufactured until 1988 by Sturm, Ruger & Co. These revolvers were marketed to law enforcement duty issue, military, and civilian self-defense markets.
Development and history
As far back as 1966, Ruger designers Harry Sefried and Henry Into began working on the company's first double-action revolver. Despite being popular with civilians, founder Bill Ruger hoped to expand into the law enforcement and private security markets, which were then dominated by rivals Smith & Wesson and Colt. The introduction of the Security-Six and its variants marked Sturm Ruger's first attempt to sell a custom double-action revolver, deviating from the corporation's earlier designs which were outdated Colt Peacemaker-style single-action revolvers. Ruger used investment casting for most parts in an effort to hold down production costs. As with all Ruger firearms, the Security-Six revolvers were robustly designed with large, heavy-duty parts for durability and to allow for the investment casting process.
Sefried had previously worked for High Standard Manufacturing Company, where he designed the High Standard Sentinel revolver. The grip profile of the Sentinel was reused on the "Six" line. Ruger's new revolvers were unlike other guns on the market in that they used a one-piece frame, rather than a removable sideplate, which lent them superior strength.
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