Smith & Wesson, 637, J-Frame Revolver, 38 Special, 1.875, Aluminum Alloy Frame, Matte Silver Finish, Rubber Grip, 5 Rounds Matte silver finish Lightweight alloy frame Stainless steel barrel and cylinder External hammer Product Description Smith & Wesson J-Frame revolvers have had your back since 1950. These small revolvers were designed to fire a full power round and are as simple and easy to use as they are reliable. Available in various calibers and with three diverse hammer designs, it is no surprise that the Smith & Wesson J-Frame has become the most popular, small-frame, defense revolver on the market. The Model 637 is a variation of the Model 37 Chiefs Special Airweight that integrates the time-tested features of the original with modern advancements. This ultra-light revolver is a favorite back-up and concealed carry firearm. Specifications UPC REDACTED03 Manufacturer Smith & Wesson Manufacturer Part # 163050 Model 637 Action Revolver Size Small Frame Caliber 38 Special Barrel Length 1.875" Color Silver Grips Rubber Capacity 5Rd Hand Right Hand Manufacturer Wt 15oz Sights Fixed Sights Subcategory Revolvers Material Alloy.