Our Guide Rod Laser Glock 19 sighting system is compatible with Glock 19 MOS (Gen5), Glock 19 Gen5, Glock 19X, and Glock 45 pistols. This revolutionary internal laser replaces your Glocks factory spring guide assembly. This creates an integrated sighting system that delivers accuracy and durability. The high-intensity red laser provides exceptional visibility, even in extreme environments. You can program it to produce a steady beam or pulse. Its easy to install with no special tools or gunsmithing necessary. Crafted out of rugged materials, including aircraft-grade aluminum, this laser system can hold up to even the heaviest impacts. The design is exclusive to LaserMax. Automatic 10-minute time-out mechanism prevents accidental battery drain.