I finally got around to tearing apart Auroras gun. The screw was a little tight, but the real problem was the peg that the barrel pivots on was a little too thick. I shaved it down using an exacto blade. Probably would be easier to have used some sandpaper but my method worked pretty good. Now it's tight enough to stay stright and loose enough that I don't need tools to bring out the barrel. Hasn't there been any news on the next Not-Throttlebot? I'm hoping they don't scrap their plans on finishing them off..