Designed specifically for use in glock 19 (gen4) pistols the lms-g4-19g 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.Power Switch: Ambidextrous On/OffWavelength: 532 nmDot Size: .31" @ 7 ydsPower: 5mWRange: 20 yds Day/300 yds NightWeight: 0.55 ozLaser Color: GreenFirearm Fit: Glock 19 Gen4Adjustments: NoFinish: BlackMount Type: Guide Rod