Designed specifically to fit the .380 Glock 42, the Lasermax LMS-G42 Guide Rod Laser produces a visible red laser from right underneath the muzzle with no gunsmithing required. The laser sight is aligned permanently in the factory for a center-of-mass accuracy at 10 yards and doesn't need to be re-zeroed after you change the batteries. The custom take-down lever is complete with an ambidextrous switch that is very similar to the factory Glock take down lever. Deliberate on and off activation allows you determine when to activate the sight, making it perfect for self-defense and tactical situations. This laser sight also meets or exceeds numerous Mil-Spec and Homeland Security durability standards, including deep water immersion, blowing sand, extreme temperatures, salt water fog and over 20,000 rounds of live fire.