http://www.gun-parts.com/remington22rifle/
Bob's could be a good source.
The Old Carnival Guns go way back to the early 1900s. Back in the day you could go to a midway and win a cuipe doll for your sweet heart, plus impress her with your marksman ship. One summer, as a teenager, I got a job working for a carnival and spent sometime folding canvas tents, popping off a few rounds and trying to sneak into the Hootchie Koochie Show Tent.
Here's a rather descriptive video of a really nice looking one, that's seems to have survived the years.
Congratulations of your find.