From the leftover plating on the hammer and trigger, it has been redone once already. Anything you want to do will require you to remove the rest of the plating. There is not enough gun left to give you a good blue job, maybe a bead blast and black gun specific paints like duracote or ceracote, after you replace those buggered up screws and tune up the action. Me, I would just tune it, clean it, and shoot it.

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Regards,
Guy-Harold Smith II