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An answer to Colt's Detective Special and Smith & Wesson's Chiefs Special, the Ruger Speed-Six revolver was intended for use by plainclothes detectives and others desiring a more concealable handgun. The revolver, a variant of the Ruger Security-Six and Service-Six, incorporates fixed sights and a round-butt frame, and was available in .357 Mag., .38 Spl., .38 S&W (.380-200), and 9 mm Luger. The standard barrel lengths available were the same as those for the Service-Six, but also included a 3" length in certain law-enforcement contract orders, until the agencies using the revolver ultimately adopted .40 cal. semi-automatic pistols. For more on the the Ruger Speed-Six revolver, watch this "I Have This Old Gun" segment from a recent episode of American Rifleman TV.
Among the machine guns used by all the powers involved in World War I, the Austrian Schwarzlose is often forgotten. But this simple, reliable arm saw service for more than 20 years across two world wars.
For the Union Army during the American Civil War, its officers and cavalry troopers relied on one of Colt's most notable firearms: the 1860 Army revolver.