Smith & Wesson J-Frame revolver is designed to fire a full power round and is simple and easy to use as it is reliable. The Model 637 is a variation of the Model 37 Chiefs Special Airweight which integrates the time-tested features of the original with modern advancements. It is ultra-light and is a favorite back-up and concealed carry firearm. This model has an aluminum alloy frame with a matte sliver finish, stainless steel barrel and cylinder, integral front and fixed rear sights, and an external hammer. It also has black Crimson Trace Lasergrip.