Crimson Trace LG-661 Smith & Wesson M&P Compact Red Lasergrips - Black - The LG-661 laser sight is an engineering marvel for Smith & Wesson M&P Compact semi-automatics. Interchangeable between calibers, LG-661 Lasergrips directly mimic the look and feel of the original grip, with the tactical impact of laser sighting. Activation is in the rear of the weapon on this model, instinctively springing to life when the pistol is held in a natural firing grip. The LG-661 received the Academy of Excellence Award for "High Tech Product of the Year" in 2008. Activation Location: Rear Activation Activation Type: Instinctive Activation Attachment: Grip Attachment Beam Intensity: 5MW Peak, 633NM, Class 3R Red Laser Dot Size: Approx. 0.50in At 50ft Fits Smith & Wesson M&P Compact .9mm, .40 S&W, .357 Sig Models Except .45 Compact And Ambidextrous Safety Models. Does Not Fit M&P M2.0 Models