Allen Company X-Ring Laser Universal Bore Sight - The Allen 70648 X-Ring Laser Bore Sighter provides precise and accurate bore sighting for a wide range of firearms, including rifles (.177 to .50 cal) and shotguns (12-20 Gauge) Save time and ammunition by easily and quickly zeroing your firearm's sights or scopes without firing a single shot Built to last, this bore sighter is constructed from high quality black steel, ensuring durability and longevity in the field Compatible with a variety of firearm calibers and gauges, making it a versatile tool for firearm owners and enthusiasts Its compact size and lightweight design make it easy to carry in your range bag or toolbox, ensuring you can use it wherever you go Achieve better accuracy and tighter groupings by ensuring your sights or scopes are properly aligned with your firearm's bore By eliminating the need for live-fire zeroing, the bore sighter helps you conserve ammunition and reduce costs The X-ring laser bore sighter is easy to use, even for beginners, simply insert it into the firearm's chamber, and the laser provides a clear reference point for adjusting your sights or scope This bore sighter is powered by batteries, ensuring you have a reliable power source for extended use.