The receiver I would rub down with a chore boy with some FLITZ polish on it. The grip cap I would put masking tape over the wood and use 400 grit wet or dry sand paper on a sanding block to remove most of the roughness. On the pits after the polish I would put some Oxypho from Brownells on it.

It can be a crap shoot sending the rifle back to Ruger.

"When you disarm the people, you commence to offend them and show that you distrust them either through cowardice or lack of confidence, and both of these opinions generate hatred." Niccolo Machiavelli