SSI LBK-DX Muzzle Laser Bore Sight Master Kit, This boresighter makes sighting your rifle or shotgun easier than ever! The SSI laser and unique adapter kit provides stabel alignment producing accurate bore sighting results. This versatile system will work on everything from .17 to .50 caliber as well as .410, 20 and 12 gauge shotguns. Complete system includes two sighting posts, o-ring adapters, reflective target all in a compact portable nylon carry case