The LaserMax Guide Rod Laser (Green) is designed for Glock 19 Gen 4. The LaserMax Guide Rod Laser for Glock meets or exceeds both Mil-Spec and Homeland Security durability test standards (drop tests, blowing sand, temperature and humidity extremes, salt water fog, deep water immersion and 20,000+ rounds live fire). If you can field-strip your Glock, you can install your LaserMax Guide Rod Laser sight-No gunsmithing to your Glock required.
A pulsating green laser beam gives effortless awareness of muzzle direction and it transcends language barriers. It can be used outdoors from dusk till dawn, or indoors round-the-clock. Infra-Red versions are optimized for NVG characteristics. The Internal Guide Rod lasers for Glock come permanently aligned from the factory for center-of-mass accuracy at 20 yards. It will never drift out of alignment. There is no need to re-zero after changing batteries.