Crimson Trace LG-307 Lasergrips S&W K/L-Frame Square Butt Laser Sight - Red - The LG-307 Lasergrips laser sight for Smith & Wesson K/L-Frame (square butt) revolvers features a comfortable rubber overmold grip that provides ideal comfort and security for large caliber revolvers. The laser activation switch is located in the front of the revolver's Lasergrips, making activation instinctive when you assume a normal firing grip on the revolver. Beam Intensity: 5mW Peak, 633nm, Class 3R Red Laser Black Rubber Overmold Grip Replacement Dot Size: Approximately 0.5in At 50ft Front Instinctive Activation Button