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When I was kid they used to sell racecars that you inserted a co2 cylander in the back end of it and you had this spring loaded plunger thing you pulled back on and let go it pierced the end of the co2 cylander and the model racecar shot off. They were guided by a long string that was anchored to the ground by long nails to keep them going strait. Might be possible to make some foam rounds that you could put a co2 cylander in the bottom end and rig up a pierceing device.
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