This is my first instructable,so it's not very good.
To start, here is a pieces list:
Orange track pieces:3
Step 1: The Handle.
This is a very simple handle.
If you want a better one, then try to make it yourself.
I think that would'nt be so hard.
Step 2: The Stock/butt.
This may look a little crappy, but if you want you can change the stock the way like like it.
Step 3: The Trigger Mechanism.
This is just a simple slingshot mechanism.
Step 4: The Barrel.
This barrel is not so hard to build, but don't try to cheat and leave some open spaces between the orange connectors, because maybe it'll break then.
Step 5: Connecting It Together.
This step shows you how to connect all the parts you've made.
Step 6: The Quad-pod.
This is my pneumatic quad-pod.
If you put some weight on it, it'll bounce down and break the "fall".