brand new barrel, NOS barrel extension problem

[blackreichswehr]

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.

[bjrmg]

Check head space to see if barrel threads are too shallow when bound up; and also check barrel dimensions to see if in spec. I can recommend a competent professional gunsmith here in Texas who can assist you. JR Houston Texas

[blackreichswehr]

thanks for the help, figured it out myself

[Schwartzer]

Sooo what did you find?

[blackreichswehr]

ordered a P.O.S. used extension with just the stub poking out. removed the barrel stub and compared the thread count to my new barrel. as I had thought, the threads were cut to shallow. put the new barrel in the lathe and finished the threads. p--s poor quality control, must have been 4:15 on a Friday, last barrel for the day.

[JBaum]

I remember recently encouraging someone to just pay the extra money and get an original barrel.

Considering that he was without your skills to be able to fix a screw up, he and I both agreed that it was a wise choice.

If it was easy, everybody would build a 42. It certainly separates the AR15 "builder" from the more serious and dedicated crowd. Atta boy.

[along]

lol glad someone out there has a lathe (I'll get one someday)

after being 11 months in, I'm getting closer to finishing, thanks for the encouragement jbaum