The LaserMax GLOCK Guide Rod Laser Sight features a high-visibility, red-orange pulsating beam that can be seen outdoors from dusk to dawn. It is quick and easy to install and is completely internal, allowing you to keep your current holster, tactical light and grips. The laser sight stays aligned even after changing batteries, and it meets or exceeds MIL-SPEC and Homeland Security durability tests. For use with GLOCK 19, 23, 32 and 38 models.