AIMShot Laser Boresight with External Battery Box

Using the AIMShot® Laser Boresight with External Battery Box makes sighting in your firearm fast and easy. The external battery greatly extends the run time compared to bore sights powered by conventional internal batteries. Simply insert the boresight into the firearm's chamber, spot the laser on a target, and adjust the sights to match the laser dot. Powered by 2 AAA batteries (not included). Brass construction will not harm chamber.