Okay here is a super stupid thought, if all was fine before-and since these parts develop their own unique wear spots, could it be possible that your barrel is re-installed upside down so the barrel block side is facing up which was previously facing down?
This is not a functional issue, but on a re-welded custom-fitted semi, might it become an operational issue??
“… corporations have been enthroned, and an era of corruption in high places will follow, … until all wealth is aggregated in a few hands and the Republic is destroyed.”
- Abraham Lincoln (Republican), Nov. 21, 1864