<p>Unlike other laser boresighting systems that insert into the muzzle of the firearm, Sightmark Laser Chamber Boresights are precisely engineered to fit into the chamber, ensuring exact and consistent laser alignment with the bore. Soft brass construction delivers lasting durability and performance, without the risk of damaging your firearm's chamber. Sighting in your firearm has never been easier. Load the laser into the chamber, place the dot on a target downrange, and align your sight's crosshairs or dot with the projected spot. Operates on 3 AG3 batteries (included) and includes a convenient carry case.</p> <ul> <li class=>Soft brass construction</li> <li class=>Compact and lightweight</li> <li class=>Precisely engineered to fit into the chamber for perfect bore alignment</li> <li class=>Includes convenient carry case</li> <li class=>Operates on 3 AG3 batteries (included)</li> </ul>