That sounds like it may be what's called a rolling block. If it is it's pretty old. On those, the block (front piece that goes right behind the cartridge) has a firing pin and spring inside. When struck, the pin can move forward and strike the primer.
I have a couple of these including one youth model. One of mine is a Stevens Favorite and the other is a Remington. If you can find the make and model, you probably have a good chance at getting a stock for it.
I could be wrong though and don't profess to be an expert. There are so many different actions made that its crazy.
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