I was polishing a barrel today in preparation for rust bluing. Thought some of you would be interested in the process. I built this handy lathe accessory many years ago. It has other uses: Below, fitting a barrel band front ramp. I grind the barrel a few thousandths under the ramp bore size in preparation for silver soldering. Here I am grinding the front ring of a M98 receiver to remove the markings. The chuck, and receiver, are rotated by hand back and forth.