Step-up to a more powerful laser bore sighting solution with the SiteLiteA(R) SL-500 Laser Boresighting System. Its ultra-bright Green laser if 50x - 100x brighter than red lasers for better daytime visibility. Super-powered Green laser is 50x - 100x brighter than standard Red Super-strong magnets securely center the laser within muzzle Fits .22 to .50 cal., 20-ga./12-ga. shotguns, plus muzzleloaders No metal contacts the rifling, no optional arbors needed Up to 10 hrs. continuous run time Unconditional Mfr's Lifetime Warranty Order today!