to remove any rust inside the barrel, would a plan of first plugging the barrel and carefully filling it with a vinegar solution, then wipe down with a fine copper bore brush, neutralize and then oil it to protect it work? ive often used vinegar to remove rust on parts though I wouldnt want to be too aggressive, and I certainly wouldnt use it on the outside of the barrel out of fear id strip patina away. its just the inside hasnt seen a good cleaning in years and im concerned about letting the rust in there continue to build up, and vinegar in my experience eats it away quickly without being strong enough to seriously affect the "healthy" metal. Ive tried a "patch" of steel wool and a normal solvent for gun bores which has helped but not to much extent.
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