I don't have the 2-G model, but I do have a 550-1 that I really like.
What do you need to repair on there?
So far, I believe it needs a new action spring and extractor components. It also needs a really good cleaning, and it's missing its deflector (which seems like a strange component to me anyway)
What I find really interesting is how this thing was originally at some kind of county fair or something like that. It's hard to imagine seeing something like that at the fair today. This thing must have 1000's of rounds through it, I would guess.