Designed specifically for use in Glock 19 Gen5, Glock 19 MOS Gen5, Glock 19X, and Glock 45 pistols, the LMS-G5-19 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.