AimShot ARPRC 300 PRC and 6.5 PRC arbor for use with any of the AimShot 223 laser bore sights. This arbor will fit over any of the AimShot 223 laser bore sights and allow you to bore sight any 300 PRC and 6.5 PRC Precision Rifle Cartridge based rifles. This will also work in most wildcat cases that have the same taper/diameter bodies This product is only the arbor. In order to use as a bore sight you need to use one of the AimShot 223 lasers. We recommend using the MBS223 modular laser bore sight as it includes both battery options- the small LR41/AG3 alkaline batteries for use in closed chambers, or in most rifles we recommend the external battery pack that gives you 20+ hours of run time with easy to find AAA batteries. But you can use any of the AimShot 223 bore sights with the arbors, even the BSB223G green laser bore sight!