Firefield FF39016 In-Chamber 223 Rem/5.56 NATO, Red Laser 632-650nM Wavelength

Designed for perfect performance in a 15-120F temperature range, Firefield In-Chamber Red Laser Boresights feature <5mWoutput power, 632-650 wavelength and are constructed of rugged, polished brass to truly mimic real ammunition, improve chambering and better protect internal components. Powered by two AG5 or three AG3 batteries for up to one hour