Please elaborate into the metallurgical foundation for this conclusion. Not trying to prove right or wrong, just really interested about your theory that the non-metal brushes are revealing an insidious source of damage.
Not theory. There are/was photos out there. The shooter I know took a section out of his barrel for hard evidence. He also put it in a lathe to see how it machined up like butter was the comment. There had been discussion on another forum which he joined to find out more. When he put up his issue and evidence he got banned.
His barrel was the same make as the one where the cleaning rod got the blame.
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