Yeah, I did apply some heat with a small butane torch. Didn't want to push it and risk affecting the temper of the receiver. I didn't see any threadlocker- I can't imagine how much torque they put on that barrel at the factory...
Sharp whacks with a dead-blow hammer busted it loose eventually. That's after I came across a tip to use powder (no rosin at the house!) in my homemade barrel blocks to keep the barrel from slipping.
Screwed the new one on just now (with anti-seize!), after grinding out and re-doing the bedding for the recoil lug.
Let us know about the bolthead...
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