Just got an old Brazilian 20ga for my kids. The threads of the screw-in front bead protrude slightly into the barrel. Can I just sand the protrusion off in place? I mean, wrap some fine sandpaper around a dowel and file that smooth to the barrel? I figure a gap may be as bad as a protrusion, and this way, I'll wind up with a smooth surface.
Or will I damage some finish on the barrel with sandpaper marks?
Or will I damage some finish on the barrel with sandpaper marks?