Sir , I have done it , and you dont have to "mill" it off ---- what i did was buy a block of aluminum and a drill bit that was a few thousands of a inch smaller than the barrel dia. -(the area of bbl. directly forward of the compensator, ) and bandsawed this block of alum. in half after i drilled the hole in it , and placed the blocks around bbl. put the thing in a vise , and with a action wrench i unscrewed the bbl. off --- no big deal !