VOTATU Laser Bore Sight for .223 Rem 5.56 mm NATO Cartridge BoreSAVE AMMO: Reduce wasted ammo, the fastest gun zeroing and sighting way to boresight your scopes & sights without firing any ammo. High Visibility Laser: Powerful class IIIA <5mW 632 650nm red laser beam, with a 100 yard sighting range, perfect for helping you get on target quicker. Accurate: Precision machined lightweight aluminum casing for optimum accuracy, finished in gunmetal grey. Long Life Time: Two extra set of batteries included,comes with 3