The Crimson Trace Lasergrips platform is a decisive tactical advantage for handguns and changes the way gun owners approach personal protection. It offers immediate targeting laser beam when you hold your gun in a natural firing grip. The Instinctive Activation saves precious time when seconds count. The Lasergrips features a master on/off switch, easily user-installed with zero modification to your firearm and are completely user-adjustable for windage and elevation. *Note- Fits all metal frame Ruger P-Series pistols, including 85, 89, 90, 91, 93, 94 and 944.