Your post prompted me to take a gander at your web site.
I have a spot of bother with a project that you may be the fella to handle it.
I ended up with two good, most probably great barrels.
I had a REM 722 that was due for some tinkerin'.
I screwed off the the old barrel, cleaned up the thread (read wire brush here
The two other bbls are a slow twist and a fast twist.
Both were made for the same action (40X)
I figured that if one barrel screwed in I could dink around with recoil lug thickness and get the head space correct.
However, as my luck goes, the slow twist barrel screws in very easily.
But the fast twist bbl makes it about half way then binds up (note I'm not using a vise and wrench here
This is one of those inexpensive builds and I'll like to do no more than necessary and really don't want to do anything to the barrels though I don't know if that's possible.