Barlein barrel through a borescope

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Has anyone ever scoped a barrel and found it completely free of any mark, scratch, "defect", etc?

I’ve scoped around 60 and found probably 10 that had abundant minor defects, and the rest were pretty clean. Received one from a builder who is now out of business that was supposed to be a bartlein. Worst looking bartlein (if it was in fact) I’ve ever seen. Found some major defects in a friends barrel after trying to push a patch through before assembly and patch would barely come out of muzzle. I mainly use mine to monitor throat erosion on my long range rigs.