Took apart that firing pin assembly. Not great. Heavy pitting on the firing pin, main spring a bit rusted, shroud covered in surface rust. If you are planning to refinish a metal surface, please, please make sure there is no active, surface rust on it. I can show you a trick in case you have some rust, but don't want to refinish it yet. In fact this trick is used by many high end gunsmiths, so I can't take credit for that
Anyway, here are the parts minus safety that is left out of the picture.
Tiger stripes? No, that's some really ugly pitting.
In fact very deep, so I won't be able to fix it completely, but I can make this action a bit smoother for sure. How?
Let's kill the active rust first.
Polishing time, 400, 800, 1000, 2000.
Effect before oiling (some small pits are still visible, but they aren't active any longer).
The shroud is covered in rust. I need to stop it. Let's just say, that sanding is out of question though (with Mauser it is actually recommended not to sand the action parts as it can affect heat treatment that is very thin).
So, what's the trick? That's the trick. Not any metal polish. Blue Magic cream.
Why? That's why. Bluing wasn't affected at all, but the rust is gone. Don't try that with any metal polish though.