The .223 Rem Laser Bore Sight from Firefield is a useful accessory for quickly and precisely zeroing your firearm. With this tool, will you not waste time and ammo by tediously aligning your optic with a trial-and-error zeroing technique. To zero your weapon with Firefield's Laser Bore Sight, simply place the cartridge-sized laser in the chamber, turn on the laser, and align the sight with the red dot projected on the target. You will achieve a perfect zero in moments without using your rounds or precious time at the range. The laser has a durable anodized aluminum housing and is designed to seamlessly fit in the chamber of your .223 Remington caliber rifle.