If you know someone with a large enough ultrasonic cleaner you should try it. I can remove your barrel for you if you want. I think what you're seeing is lead and or copper.
I think a good ultrasonic cleaning and then clean the dogsh** out of it with Sweets 762, then Slip2000 copper cutter and/or KG stuff then maybe JB bore paste. Do this once a day for a week or two and you'll be amazed at what will come out of a barrel. Do use a cleaning rod guide. I use a JP cleaning rod guide and Dewey cleaning rods.


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