LaserMax LMSG417G Guide Rod Laser Green Laser 5mW, 532nM Wavelength Compatible W/Gen4 Glock 17/34

LaserMax Guide Rod Lasers meet 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). It has an on/off switch on the takedown lever. No gunsmithing required to install. These models fit Glock pistols and have a red or a green laser.