You guys, seriously. Rubber band guns. I am just finishing up one that I cut out on the laser cutter last weekend and it is going to be FREAKING AWESOME. If you build one, rather than using dowels for the pivots I recommend trying small framing nails or brass rod.
Just search YouTube for "rubber band gun" and you'll find a couple free plans. The guy I got this from its going to post plans for an 1873 Winchester rubber band rifle next month and I cannot wait.
Sent from my phone. Please excuse my brevity or any typos.