This Smith & Wesson J-Frame revolver is designed to fire a full power round and is as simple and easy to use as it is reliable. The Model 640 Pro Series is based on Model 40 Centennial, the Model 640 is a small frame concealed hammer revolver that packs a full-sized punch. It integrates the time-tested features of the original with modern advancements and competition specifications and features. This model has a stainless steel frame, cylinder, and barrel, and an enclosed hammer. It also so has black after market grips as well as the original grips this gun has also had a trigger job done by a professionla gunsmith. It also comes in the original box and all the original papers etc.