I have a question on polishing the chamber of my 308AR. First off, has anyone ever polished their chambers on their 308AR, and if so, what did you notice afterwards? Secondly, how did you/what did you use to polish your barrels' chamber? I am experiencing some misfeeds that look like they are due to a bit of drag from the brass within the chamber during extraction. I am looking to eliminate any drag due to my chamber, and this is the first step in dealing with any drag problems. A second step will be done if necessary, and that will be done only if polishing doesn't work. Info on the rifle: APF factory built 16", match chamber, and I need it to work without reservation, with even slightly not perfect ammo.....