StrongTools Red BoreSighter 177 to 12GA Caliber Rifle Scope Handgun Hunting Red Dot Boresight Kit Press Switch Bore Sight 800mAh Battery

Instructions: 1. Assemble the battery into the boresighter. 2. Select the proper adapter that fits in the barrel of your firearm. 3. Assemble the adapter on the small end of the boresighter, then scr...