Brass - just polish it. If you don't have a buffer wheel, sit there with a can of Brasso and some rags. When it's shiny enough, you won't notice the pittings. Heck, sometimes they're casting pits when the foundry didn't heat the molten brass enough.
The barrel. Draw file it or polish it and then rebrown it. It's no big deal. The main thing is to clean the bore and make sure that it can still shoot. A pitted bore can still be an accurate bore.
Lock. Find someone with a vibratory cleaner and immerse it. That'll get the junk out. As for trigger creep, you're going to have to work on it and I know those locks are coil spring, not the older "V" springs found on the originals. I can't give you advice on how to adjust it but you can start with a parts diagram.
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