The Smith & Wesson J-Frame has become the most popular small frame personal defense revolver on the market. This aluminum-framed 5-shot revolver weighs a mere 15 ounces, yet proves to be extremely accurate and reliable. The 642 is calibered for .38 Special rounds, the most trusted revolver ammunition available. Includes a built-in Crimson Trace lasergrip, giving you on-target laser precision for improved accuracy. Installed, the sight maintains all the original handling characteristics of your pistol. Ambidextrous one-touch activation. Easily mounts under factory or custom grips. Double action only. Matte silver finish.