First produced in the 1950's as a response to the popularity of cowboy shows on TV, the Single-Six is Ruger's classic cowboy-style revolver. Early model Single-Sixes are often known as Three Screws due to their three cylinder frame screws. The original flat cartridge loading gate was changed to a contour or round Colt-style gate in early 1957. The varnished walnut grips became standard around this same time period. This single-action revolver features a blade front sight with a rear groove and black synthetic grips. Its grips and metal are in good condition and its bore is in very good condition.