LASERMAX Guide Rod Green Laser Sight For Glock Gen 4 Model 20/21/41 LMS-G4-1151G. Green guide rod laser for Glock 20, 21, 41 Gen 4. 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: Compatible with Glock guns, positioning allows for the closest and most consistent relationship between your point of aim and point of impact (POA/POI) over all shooting distances. Ambidextrous Controlled Activation in the custom take-down lever that very closely fits the factory GLOCK take-down lever. Installation takes minutes: If you can field strip your gun, you can install your LaserMax Guide Rod Laser sight. Guaranteed to be within 1-inch POA at 10 yards with no adjustments needed. Designed specifically for Glock 20 (Gen4), Glock 21 (Gen4), and Glock 41 (Gen4) pistols, the LaserMax Guide Rod Laser Sight for Glock (LMS-G4-1151G). Easily user installed without the need for gunsmithing or special tools, the Guide Rod Laser is constructed with rugged, precision components including aircraft-grade aluminum and genuine Wolff springs. GLOCK does not warrant or represent that this product is compatible with GLOCK pistols. 0.33 at 10 yards. 15° to 120° F. Our normal hours of operation are Monday through Friday 8am – 6pm CST. Gritr 7901 Boulevard 26, Suite 200 North Richland Hills, TX, 76180. We are open to the public. Dear Customer: After the Supreme Court’s ruling on South Dakota vs. Gritr is committed to compliance with these new regulations. If you have any questions about this new policy, please contact the Department of Revenue office in your state. We apologize for any inconvenience.