Laser Max Guide Rod Laser for Glock 20/21 Models Finger Groves and Rail Red Beam

Replaces the factory guide rod and spring. Single sided activation switch. 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, 20,000+ rounds live fire). Installation takes minutes. No gunsmithing required.