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It looks like they tried to transition between longitudinal rifling and radial, yikes. As for the pitting, almost has that copper-ish color to it, any chance its fouling?
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It looks like fouling--but that's an aberration of the borecam photo--this is a new unfired rifle as of the time I took the photos (I fired some tubbs coarse grit lapping bullets today to see what would happen).