The AR44 arbor is the arbor to fit 44 Remington Magnum, 44 S&W Special and many other cartridges based on the 44 Magnum. This is the 44 arbor that is a hollow shell that fits over the AimShot 30 carbine laser bore sight. This product does not include a laser, it has to be used with the AimShot 30 Carbine boresight.