I was shooting my model 63 recently and notice the problem. I ususally clean after shooting, but I must have missed the cylinder chambers on the 63 as there was some carbon buildup. Anyway, I removed the cylinder, and soaked it in hoppes for a day. Cleaned with patches and thought the cylinders looked fine. I thought I'd try some lead removal cloth though, as that is what I use on the cylinder face when it gets really blackened. Sure enough, despite all my cleaning, all the cylinders gave up a bunch of carbon to the lead removal cloth.
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