Barrel installation

[RBruce]

I'm installing a new barrel in my A1 upper. It tightens up at1 o'clock, but is loose at 12 o'clock. What are my options? Thanks for any advice.

Information

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[browningautorifle]

Do you mean the serrated barrel nut won't allow the gas tube through when tight? You have a tooth in the way? Did you grease the threads?

[RBruce]

Got it, Thanks