Wheeler 589922 Professional Laser Bore Sighter Laser Boresighter Laser AluminumProfessional Laser Boresighter uses a high power daylight visible green laser and a high strength magnetic connection to the barrel to deliver fast accurate bore sighting. This system works with virtually all rifles, shotguns, and 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