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. *Note- fits S&W M&P Full-Size .9mm, .357 Sig, .40 S&W, .45 ACP except ambidextrous safety models. does not fit M&P M2.0 Models.