The Crimson Trace laser sight series compatible with GLOCK compact and subcompact pistols provide a tactical advantage in a compact package. Instinctively activated with a normal firing grip, the Lasergaurd leaves the best attributes of your GLOCK unobstructed and unaltered. The LG-436 fits most holsters for subcompact GLOCKs and features a master on/off switch so you can train with or without laser sighting. Laserguard fits: Glock Gen 3/Gen 4 19/23/25/26/27/28/32/33/36/38/39 Gen 5 19