Designed specifically for use in Glock 42 pistols" the LMS-G42 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 a stainless steel tube.

Features:
Pulses for superior visibility and faster identification
Internal design does not restrict grip or holster selection
Ambidextrous ON/OFF switch