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Message: <blockquote data-quote="BReeves" data-source="post: 3499250" data-attributes="member: 10973">Cut an old single shot 12ga down and what I did your not supposed to do. I used the side of the the grinding stone on my 8 inch bench grinder. Just held the barrel at 90 deg and rotated it against the grinding wheel taking off the high spots. After I had it pretty good cleaned it up with 400 then 600 grit sand paper.Common wisdom says never grind on the side of a grinder but I was careful and didn't use alot of pressure.</blockquote>