Quote Originally Posted by earl39 View Post
Thomae index marks won't work in this case as he is going to change the recoil lug and i would bet good money they are not going to measure the same thickness down to the thousandth of an inch unless you are wanting a mark on the threads to index off of, which is also doubtful as the barrel is most likely going to move a bit when the nut is broken loose.
Why would the index marks not work? The nut is essentially an adjustable shoulder, it doesn't care about recoil lug thickness.