Firefield FF39012 In-Chamber Red Laser Boresighter 308 Win/243 Win/7.62x51mm

The Firefield FF39012 is a red laser boresight designed for quick and accurate zeroing of .308 Winchester, .243 Winchester, and 7.62x51mm NATO rifles. Features a 632-650nm wavelength red laser with <5mW output power. Constructed from rugged polished brass to mimic real ammunition for improved chambering and component protection. Operates in temperatures from 15-120°F and is powered by two AG5 or three AG3 batteries providing up to one hour of runtime. Essential tool for precision rifle setup and initial scope zeroing.