I used a 12" disc sander at work to finish it. Came out better than expected. Perfect, no probably not. I have had a couple friends ask me to shorten guns for them since seeing mine. Go slow. I scribe a line on it to rough it in then I mount it on the stock. I wrap stock in duc-tape and finish sanding. The small hand held dremils will do a fine job of smoothing it out. Hope this helps.
Gary