Just as good as a pocket full of rocks
(Finished it for you 😁)
Fatal Bert said one time that he'd noticed their barrels were softer than other manufacturers he had dimpled for the gas block set screws.
Could the scope bdc be setup for a 20" barrel? As to the adjusments not "adjusting" as expected, I've had budget optics do this often. However, they usually held zero once finally set. Very interesting info you provided. Thanks and Merry Christmas!