This versatile system will work on everything from .17 to .50 caliber. The Sight-Rite laser bore sight comes with an alignment target and a durable storage pouch. FEATURES For use on .17 to .50 caliber Alignment target and storage pouch included Patented design No metal on metal contact Will not scratch the finish of the barrel or damage your rifling Instruction and batteries included Mfg: Shooting Made Easy