The Crimson Trace Laserguard series for GLOCK pistols introduce an even more compact housing than traditional lasergrips, and provides instinctive grip activation while leaving the best attributes of GLOCK guns unobstructed and unaltered. The LG-436 fits most holsters for sub-compact GLOCKs, and is the company's first GLOCK model to offer a master on / off switch so you can train equally with the laser on and with it off. The under-barrel design improves accuracy and offers instinctive ambidextrous activation. Currently the Laserguard series fit GLOCK 19, 23, 25, 26, 27, 28, 32, 33, 36, 38, 39.