Wheeler Professional Laser Bore Sighter -This system works with virtually all firearms; rifles, shotguns, handguns. The magnetic connection to the end of the muzzle provides more precise alignment with the bore without the risk of damaging the bore, compared to arbor style bore devices. A machined aluminum body with soft rubber over-molding houses the laser module. Each unit is hand tuned during the manufacturing process with an innovative calibration mechanism. Runs on an included single Lithium 123A batteryMolded plastic storage case includedMakes initial scope adjustment simpleRed Laser Reflective Sighting Grid included