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Signing UpStep 1: Materials
2. A waterbottle that fits in the pipe.
3. A plastic tube
4. Corke thing
5. Baking soda
6 Vinegar
7. Cone (not pictured, too lazy)
8. Duct tape.
(I made this before I knew about instructables so there aren't many pictures)








































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It's actually pretty powerful, and has a nice kick (recoil).
L