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Posted: 3/14/2011 3:04:12 PM EST
I am building a 9mm upper off of a NoDak Spud 9mm A1 upper. The Rock River barrel nut I have seems to "bottom out" on the reciver when I hand tighten it but the barrel still has some play in it. This is the first upper I am building and I was wondering if this is normal. It looks like when I tighten the nut down it will mash the reciver! Is there different length barrel nuts? Thanks for the help!
Link Posted: 3/14/2011 7:58:28 PM EST
well i am not familiar with the particular build/parts you cite , however THERE SHOULD BE NO PLAY in the barrel of course.

seems like your parts are not compatible ––you should contact the source for these different parts and ask about proper fitment / application.
Link Posted: 3/15/2011 5:08:50 AM EST
Strange - with the barrel installed, it should not be bottoming out on the receiver at all...even with 80 ft/lbs of torque on it. Can you post a pic? Sounds like it is out of spec (or (less chance) the upper receiver is).
Link Posted: 3/15/2011 6:18:53 AM EST
The stop ring on the barrel too thin?
Link Posted: 3/16/2011 12:36:56 PM EST
Originally Posted By Bretshooter:
The stop ring on the barrel too thin?


What should the stop ring be? What should be the overall length of the barren nut?
Link Posted: 3/17/2011 3:27:43 PM EST
On a take off old A1 barrel I get .992 from the rear of the extension to the ring's face, and .130 for the ring thickness.
I thought I had a print, but I must have filed it in a secret place...
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