Crimson Trace Glock Gen3/Gen4/Gen5 Full-Size Green Lasergrips - Black - LG-637G Green Lasergrips are a rear-activated green laser sight for GLOCK Full-Size pistols. Featuring Crimson Trace's famed Instinctive Activation, which allows the laser to be activated with a normal firing grip, the LG-637G includes a Master On/Off Switch for completely powering down the unit. User-installed in moments by attaching securely to the gun frame, this laser sight is fully adjustable for windage and elevation. Provides 2 hours of run time with (4) included 2016 Lithium Batteries. 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 Glock Gen3: 17, 17L, 22, 24, 31, 34, 35, 37 Gen4: 17, 22, 31, 34, 35, 37 Gen5: 17, 19X, 45