Gent's, I have an AR that will sometimes fail to extract. The case will remain stuck in the chamber. The extractor is good as I replaced the original one but still does the same thing. The stuck case shows where the extractor claw had a good hold so I'm thinking I may have rough chamber. The stuck case will dislodge easily when I push it out with a cleaning rod. It is a factory rifle and it will fail to extract after cleaning with a chamber brush/solvent. My question is, Is there a tool readilly available where I can polish up the chamber myself to see if that takes care of it?