new barrel, NOS barrel extension-- can't get the barrel collar to match face with the extension, I have 0.10 inch gap between them. tried 4 times screwing and unscrewing the barrel, using antiseize on threads and a chain strap type vise grip tool on the barrel with thin piece off rubber over the barrel-- ever time, this is as deep I goes. never had reason to separate a barrel from extension, so I don't know what the threads are supposed to look like, meaning this new barrel is threaded shallow. the new barrel came with a kit I bought 5 years back, never planned on using it. off my topic here-- who makes theses new barrels and are they button pulled or hammer forged, I would'nt know the difference if you showed me? Ok, back to the former, this 0.10" gap is unacceptable, don't just spot weld it here because I can't pean it. didn't bother with head space, because every barrel and extension I've seen the faces match. GO or No Go on this. thanx for any advice.