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 gun smithing or special tools, the Guide Rod Laser is constructed with rugged, precision components including aircraft-grade aluminum. Features: User programmable for pulse or steady beam Internal design does not restrict grip or holster selection Distinct ambidextrous on/off switch reinforces safe firearm handling Automatic time-out after 10 min prevents inadvertent battery drain Proximity to the bore provides maximum POA/POI accuracy Guaranteed alignment ensures center of mass shots