The Crimson Trace Lasergrips platform is a decisive tactical advantage for handguns, and changes the way gun owners approach personal protection. It offers what no other handgun accessory can: immediate targeting laser beam when you hold your gun in a natural firing grip. The innovation, Instinctive Activation, saves precious time when seconds count. The Lasergrips features a master on/off switch, are easily user-installed with zero modification to your firearm and are completely user-adjustable for windage and elevation. Lasergrip LG-105 fits the following round butt models: Airlite, Airweight, Bodyguard, Chief's Special, Centennial, Ladysmith, models 36, 37, 38, 49, 60, 63, 317, 331, 332, 337, 340, 342, 351, 360, 442, 637, 638, 640, 642, 649, 651 and 940.