The AR WSM is the new name for the old AR270WSM arbor for use with 223 boresight. The name of the arbor has changed; however, the fitment has not changed.
Calibers it will fit:
270 WSM, 300 WSM, 325 WSM, 7mm WSM
All WSSM
AR WSM (AR 270WSM)
$15.99 Regular Price
$13.99Sale Price