Finally got everything together to headspace my new barrel.

Barrel nut threaded on fine, everything threaded on fairly smooth. put a little dab of anti seize on the threads. tightened the action down finger tight onto the head spacing gauge. Tightened the nut against the action AND

The action turns with the barrel nut. every time i try to tighten the nut the action loosens.

I'm so frustrated right now. my last build was problem free. I've taken everything back apart, removed the anti seize and and tried again, same result!

What the heck do I do, and where do I go from here?