Experience Building The RotaryMek-10X Rubber Band Machine Gun 

Instruction book available in print from Amazon.com
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Also available in downloadable .PDF format:
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This video introduces the definitive guide book for building the RotaryMek-10X rubber band machine gun, one of the world's most advanced rubber band gun designs!
Building this rubber band gun is a complex, time-consuming woodworking project. Although successful completion of this project does not require particularly sophisticated woodworking techniques, the builder will need to have access to and be able to skillfully use a number of different tools, including a drill press, band saw, and computer-based scanner and printer.
The end result of this project is a rubber band gun unlike any other, a truly fully automatic, rapid-firing, rubber band machine gun!
In a manner analogous to a real machine gun, the mechanism of the RotaryMek-10X is driven by energy derived from the same source as that which propels the projectiles--the elastic potential energy of the stretched rubber band ammunition loaded onto the gun. There's no crank, no motor... just a trigger and a can of whoop-ass!
If properly constructed from high-quality materials, the RotaryMek-10X can be loaded with as many as seventy size 33 rubber bands at one time. The gun develops an extremely high rate of fire (think of a Minigun), but it also has a responsive trigger system, allowing an operator to choose between firing many short bursts or just letting rip, "fire-hose-style."
Please note that this project calls for the use of US-standard dimensional lumber as well as two different sizes of US-standard PVC plumbing pipe. Prospective builders outside the United States might first want to check the availability of the needed materials before committing to the project.