Designed specifically for use in glock 17, 22, 31, and 37 pistols gen1-3, the lms-1141p 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.Wavelength: 635nMDot Size: .75" @ 25 ydsPower: 5mWRange: 20 ydsWeight: 76 ozBattery: 393Laser Color: RedFirearm Fit: Glock 17 Gen1-3Adjustments: NoFinish: BlackMount Type: Under Barrel