The Crimson Trace DS-124 Defender Series Accu-Grips Laser Sight fits Smith & Wesson J-Frame (Round Butt) and Taurus Small Frame Revolvers. Featuring Beam Lock Adjustments for windage and elevation, this laser sight is pre-sighted at the factory at 50 feet. The Top N-Gage Activation Button provides a large, easy-to-find activation button, emitting a powerful 5mW red aiming laser. With its cutting-edge design and affordable price, the DS-124 sets a new standard in laser sighting systems, ensuring enhanced accuracy and confidence for revolver owners.