Brownells J-B Bore Bright 2 oz.

This is hands down the best polisher I have or will ever need to use. Coupled with the blue J-B cleaner it the best 1/2 punch for any barrel no matter what its condition. Just make sure you pack it on if needed and pass the brush 20-30 times. This thing will polish your barrel to a mirror finish. Pricey but you use less to get a faster/better result.

Great product! Cleans and protects the bore with minimal effort!

I can’t see enough about how good this product is. I restored many I old bore with this with almost magical results.

Best for stubborn jobs

This stuff can work magic on heavily fouled, rusted, or pitted barrels. For light duty, a cleaning rod will work. For heavy duty on a badly fouled/rusted/pitted barrel, get a drill.