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For mild to moderate surface rust, Marvel Mystery Oil and a bronze brush that is slightly oversize will work well, followed by more MMO and cotton or linen patches, It will be a bit of work but will clear up the bore nicely, keep repeating the process until your patches come out with no brown on them. If there are pits in the bore this will still work, but the pitting will remain, making loading difficult at best and effecting accuracy. You can have the barrel "freshed out" or re-bored by a smith or replace it all together if it is too far gone.

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