Green guide rod laser for Glock 22, 35 Gen 4 Models; Completely internal! Keep your current holster for your GLOCK, keep your tactical lights, keep your favorite grips; Extremely rugged: Meets or exceeds both Mil-Spec and Homeland Security durability test standards (drop tests, blowing sands, temperature and humidity extremes, salt water fog, deep water immersion, 20,000+ rounds live fire); Hi-Visibility Pulsing Beam: A pulsing laser beam gives effortless awareness of muzzle and transcends language barriers. It can be used outdoors from dusk until dawn or indoors around the clock; Alignment: All Guide Rod Lasers come pre-aligned from the factory at 20 yards. It will never come out of alignment and there is no need to re-zero after battery changes; Accuracy: As close to the bore of a GLOCK as possible, positioning allows for the closest and most consistent relationship between your point of aim and point of impact (POA/POI) over all shooting distances; Turn it on: Ambidextrous Controlled Activation in the custom take-down lever that very closely resembles the factory GLOCK take-down lever; Installation takes minutes: If you can field strip your GLOCK, you can install your LaserMax Guide Rod Laser sight-no gunsmithing to your GLOCK required; LaserMax Green Guide Rod lasers. High performance has never come with such a high degree of reliability; 5 year manufacturer warranty