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I didn't read the OP well enough. He said carbon rings.
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I am sorry, but I don't think you read it correctly again. OP never said
carbon rings. He said "bores of the cylinder have rings of sorts where the bullet would meet the cases. I tried scrubbing these out but they seem to be worn right into the metal."
According to the description these are cylinder throats rings. I recently went nuts trying to "clean them off" thinking they may be carbon. Until MrBorland and few other more experienced members explained to me these rings are part of the design, not a residue. Even though I fully believed them and left these rings alone next time I went to the range I asked to see a brand new, unfired 686 and saw same rings my gun had...
