Bore Lapping/Polishing for Firearms: Cheap Portable Solutions

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To remove pitting and markings from a shotgun bore, users are seeking affordable, portable tools that can be used with a drill. Suggestions include valve-guide hones, although they can be expensive, and alternative methods like wrapping sandpaper around a sponge or using a sponge mop with valve grinding paste. The challenge lies in achieving even pressure across the bore's surface due to its tapered design. Many participants emphasize the need for a solution that avoids high and low spots during the polishing process. Overall, the discussion highlights a demand for cost-effective solutions for bore lapping and polishing in firearms maintenance.
will0057
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Hi - sorry I'm not an engineer just desperate!

I want to remove pitting and marking in a shotgun bore and am having problems finding a tool which will do this in the firearms sector - and if I do I am sure it will be at a premium price - removing a small amount ie less than a thou of the internal diameter of a bore and polishing must be a fairly common requirement in engineering - does anyone know of a cheap portable tool which will do this (as opposed to factory honing) I want something I can put on a drill and spin in the bore - have tried brake honing stones but really need something which will apply equal pressure (or nearly) at all surfaces of the bore, the nearest I can get so far is to try rig up an expanding mandrel - is their anything commercially available?

Thanks
Will
 
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I'm not sure whether or not this will work for you, but it might be worth checking out. There are valve-guide hones for auto mechanics. I don't know how large a bore they can service, though. Also, you'd definitely want to rent or borrow one; they cost upward of $350.
My only other suggestion would be to wrap sandpaper or drywall screen around a sponge on a stick.
(That's not my final answer, but I've got nothing else right now.)
 
Your bore is tapered, I imagine. That doesn't help.
How about a sponge mop and valve grinding paste? Lots of rotation and reciprocation to spread the wear and avoid high / low spots.
 

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