It's an Express, not a high dollar gun. Just thoroughly clean it with Acetone or MEK and Duracoat it. Should work fine, I wouldn't spend the money on parking for a base coat. If you park it I would leave it parkerized. Completely soak it down with oil before and after hunting season. Let the oil sit on there overnight and wipe excess the next day if there's any.
"Suppose you were an idiot, and suppose you were a member of Congress, but I repeat myself." Mark Twain