Sounds like it needs to have the grips removed and get a really good cleaning inside and out. Might have some dried oil/grease from the factory gumming it up. Give it a good cleaning and lightly oil the moving parts.
"2 obvious flyers" - sounds like it has 2 chambers out of alignment. you might want to mark those so you don't shoot them (at least not your first 2 shots) if you are going to use it for hunting at all.
Sounds like it needs to be shot a lot, too, might smooth it up, some.