I know the danger of springs is going to be mentioned during this thread, but i say go for it. Behind the bb's, that air stopper would be hard to make in my opinion, and probably isn't that nessesary, but it could boost performance a bit.
Edit: Now that i am thinking about it, i really dont think that stopper would help at all because it would just limit flow and would probably cause bad performance. Correct me if i am wrong though.
Another Edit: Alright, now i think that it would only work if you were using extremely stiff springs. That piston would have to move very far and compress a lot of air to reach that hammer valve, and that small valve would need a stiff spring also to keep that pressure in until hit by the bolt. Final decision...

But the drawing is probably not drawn to scale... im stopping now.
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