Designed specifically for use in Glock 19 (Gen5), Glock 19 MOS (Gen5) and Glock 19X and Glock 45 pistols, the LMS-G5-19G 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 gun smithing or special tools, the Guide Rod Laser is constructed with rugged, precision components including aircraft-grade aluminum and genuine wolff springs. Features: Pulses for superior visibility and faster identification Internal design does not restrict grip or holster selection Distinct ambidextrous on/off switch reinforces safe firearm handling Proximity to the bore provides maximum POA/POI accuracy Guaranteed alignment ensures center of mass shots