« Reply #5 on: March 03, 2023, 05:41:10 AM »
If you read through all of the information about the Tokarev round, you'll find that the original Russian ammunition was acidic and that instructions to the early users was to wash the bore with water after shooting to reduce the effect of corrosion.
Since so much of this was made surplus, many people bought it in quantities, not knowing about the proper cleaning.
Looking at your photo, it could also be lead build-up. Consider using a foaming bore cleaner and may even a Lewis (or equal) Lead Remover arbor to see if it improves.
When shopping for C&R's at gun shows I always carry my bore light to check out the bore before buying.

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