The Site-Lite Mag Laser Boresighting System combines state-of-the-art laser technology with a magnetic system for pinpoint bore sighting accuracy. Just place the target 25 feet from the muzzle with the laser spot in the center, line up the scope's crosshairs with the dotted lines, and you're boresighted for 100 yards. It's that simple! No optional adapters are needed, and no abrasive metal parts ever contact the rifling. Super-strong magnets in the center cone securely hold the SL100 in the muzzle. Made of precision machined anodized aluminum. Fits all firearms, including .22-50 caliber handguns and rifles, 20 and 12 gauge shotguns, and most muzzleloaders. Includes a rugged compact carrying case.Manufacturer model #: SL100 MAG LASER. Accurate boresighting system No adapters needed Held securely in place by strong magnets Made of precision machined anodized aluminum Fits .22-50 caliber handguns and rifles, 20 and 12 gauge shotguns, and most muzzleloaders