My guess would be that is why these barrels were removed. I can't imagine they would have shot well and the amount of deep scratching in the chamber walls right around where you'd normally see case head separation would have been detrimental to the brass too.
Its hard to photograph but Id say the reamer was dull, crap lube, pushed to fast or failed to clear the swarf.
Regardless to what they were they are cheap tubes that with a bit of machining I will make fine shooters out of.
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