I don't know about a rebore with rifling, as I'm sure that is the more expensive route. But I just had him ream a .54 renegade to .56 smooth bore and it was 75 bucks.
deer creek sells a clean out screw replacement that comes with a small wire brush for cleaning the flash channelSomeone needs to invent or find a stiff-ish metallic "pipe cleaner" that is firm enough to go in and out of Flash Channels. There must be something similar out there in the world of machinists or similar.
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