Designed specifically for use in glock 19 (gen4) pistols, the lms-g4-19 replaces glock's factory spring guide assembly with a high intensity red 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: 635 nmDot Size: .75" @ 25 ydsPower: 5mWRange: 20 ydsWeight: 0.55 ozBattery: 393Laser Color: RedFirearm Fit: Glock 19 Gen4Adjustments: NoFinish: BlackMount Type: Guide Rod