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 642, is a variation of the Model 42 Centennial Airweight which integrates the time-tested features of the original with modern advancements. It is a small-frame, concealed-hammer revolver for concealed carry. This model has an aluminum alloy frame, stainless steel barrel and cylinder, integral front and fixed rear sights, and black Crimson Trace Lasergrip. It has no internal lock.