-Buffer Tube Milling File (intended to shave down the top of the AR-ten Buffer tube so that the charging handle can crystal clear on some upper/lower combos) The engraving took a lot for a longer time than expected and that was with eighty% with the engraving bit just spinning from https://claytonxxrxe.blogzet.com/the-ultimate-guide-to-ghost-gunner-47667056