Shilen #5 muzzle dia @ 26" is .725. Remington Varmint contours measure .830 at the muzzle on the PSS, EtronX, VS, VSS and VSSF that I measured. Rock Creek PSS contour meausured .860 at 26". The Shilen and Douglas contours are pretty close. As stated above the Shilen 5.5 is equivalent to the Rem varmint(short action) and Sendero(long action). I beleive the Lilja #5 is a bit heavier than Douglas or Shilen #5 but you can look on their site. So boils down to probably removing a little material entire length of the Mickey stock verses the wait to get factory inletting!!! Shank dia and taper as well as muzzle diameter can vary between barrel makers some despite website listing but not by more than a few thousandths generally.