LaserMax LMS1151G Guide Rod Laser Green Laser 5mW 520nM Wavelength Compatible W/Glock 20 Gen1-3/21 Gen1-3/41 Gen1-3

Designed specifically for use in Glock 20/20SF/21/21SF Gen-1-3 pistols. The LMS-G4-1151G replaces Glock's factory spring guide assembly with a high intensity green laser sighting system for advanced target acquisition. 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.