The Wheeler Engineering Professional Laser Bore Sight is constructed of a machined aluminum body with soft rubber over-molding, which houses the laser module. Its high-power laser is visible during daylight conditions, and a high strength magnetic connection ensures a solid fit to the barrel of nearly all rifles, muzzleloaders, shotguns, and handguns. A magnetic connection to the end of a firearm’s muzzle provides more precise alignment with the bore while eliminating the risk of damage, which may occur with arbor style bore devices. Each unit is hand tuned during the manufacturing process with an innovative calibration mechanism to ensure the best bore/optic alignment possible, resulting in maximum precision. Once precision calibration is completed at the factory, the laser module is permanently secured in place, ensuring reliable performance and durability. Included is a rugged plastic storage case and one CR123A Lithium battery. Makes initial scope adjustment simple, fast, and precise. Compatible with a wide variety of guns, including modern sporting rifles with flash-supressors. High power daylight visible laser. 25 yard Bore sight-in. Compatible with a wide variety of guns.