Rebuild time!
Find some nice wood, a couple dozen sheets of wet-or-dry, and a decent bench to work on, and go to town on it.
Despite the way some dealers will charge for being so "original", it's still a beater gun that will only be improved with a bit of intelligent work (like steer clear of sandblasting cabinets).
Some clean-up. Some new screws. Some new wood. Maybe a rebore, Maybe a reline, maybe just a good scrub out on the barrel.
Rust bluing is a good DIY project.
Where did you get it, and what did you have to pay? If you don't want to put in the work, flog it and buy something else to shoot.
Or just scrub down the action with oil and steel wool, fix the screws up, and take it to the range!
Cheers
Trev