Bead or sand blast then blue, that will hid scratches, file marks, and vise marks.
Horse chit.
Think I said hid them not eliminate them, i don't think he's making a show piece, if he was he wouldn't be using a damaged action to start with. If the OP brought his action into my shop and wanted it done right, I would not polish, draw file, sand the marks away. I would electroplated the area where the damage was then reblue the action to his desired finish
