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Is this the start of some kind of fouling in the barrels, or corrosion or damage? If not, what’s caused the ring marks and how can I get rid of them?

FOULING IN BARRELS

Mike George

I have known plastic fouling show as ring marks, but it usually comes out with bore cleaning solvent and a bronze brush.

However, you should always be suspicious of ring-markings inside barrels.

They might be nothing more than obstinate muck or mild corrosion, but dangerous bulges can also show as rings.

I think a visit to a gunsmith is in order.