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Flashlight Air Gun (Can break Sound Barrier)
super soaker water backpack
Pump it up! Squid Inc's Positive Displacement Pump
Build a water mortar II : design alternatives
How to do a temporary repair on a pump action water gun
Make a BB gun from a Flashlight! (700fps!)
Easy PVC Pistons + Simple Airgun
Colossal Cannon: Building a behemoth piston-valved pneumatic
Easy-Peasy PVC Water Gun
Posted:Nov 2, 2009
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