ok the gun is done. everything is glued but i cant get the piston working :@ does anyone knowss why? this sucks.
We need a bit more detail before we could help you out. Is the piston responding at all when you open the blowgun? How much pressure are you running it at?
I'd take the BA3B (Bolt action 3b, yes I know the acronym is terrible) with a front-grip 2k. The BA3B is about 50% done as of now. Expect a write-up on the entire process late march.