The AimShot Laser Bore Sight with External battery systems provides the extended run time that the traditional bore sight cannot. Allowing the operator 20+ hours of run time off 2 AAA batteries this system offers the most economical solution for all your bore sighting needs. The external battery bore sight system is intended for use of only open chamber applications. Severing the wire will render the laser inoperable. The .223 is fully functional with the AimSHOT arbor system giving the operator more versatility out of their unit. This unit gives you a True Green 532nM laser for the brightest bore sight option on the market today.