CRIMSON TRACE LG-639G LASERGRIPS RED LASER SIGHT FOR GLOCK GEN3, GEN4 & GEN5 COMPACT DESCRIPTION. LG-639G Green Lasergrips® are a rear-activated green laser sight for GLOCK Compact pistols (Third Generation 19, 23, 25, 32, 38, Gen4 19, 23, 32, and Gen5 19). Featuring Crimson Trace’s famed Instinctive ActivationT, which allows the laser to be activated with a normal firing grip, the LG-639G 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. FITS GLOCK THIRD GENERATION 19/23/25/32, GEN4 19/23/32, AND GEN5 19 (WILL NOT FIT 19X). 5MW PEAK, 532NM, CLASS 3R GREEN LASER. 0.50 AT 50.