Purchased my first AR-10 this past winter. Barrel break in was minimal but the rifle did not shoot as the manufacturer quoted, Today i took the barrel off for replacement, I was shocked to see that it took 200Ft# to remove. Now I know why it wouldn't shoot. 200Ft# could destroy the threads. I will reinstall and torque to the proper Ft# then recheck accuracy.
Check your Armalites
Check your Armalites