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[Gorp]

48. Take out the gun powder and replace it with compressed gas of some sort. It's simple.

The problem with plastics is heat. Compressed gas removes that problem. The canisters can be made from plastic. They've been around for decades but the cost was extreme because of manufacturing costs. The 3-D printers drastically reduce that cost. Same device, different creation process. And then there's wood. I only know how to make a rubber band gatling gun with wood, but I can make knives, swords, throwing stars, darts, and a lot of other weapons just with wood.

Stone is a little harder to work with, but it is also a deadly component in many weapons. Anyone can tie a rock to a stick and keep it in a coat pocket. But with the new technology, you could design a similar object and simply print it. Metal detectors won't find it and even full-body scanners would fail if it was on the opposite side from the scanner. Bone is denser.

No explosives detection technology would set off an alarm. Just don't put it in your sneakers. It's really silly to have to remove your shoes to get on a plane. We had an "underwear bomber" and I would have loved to have seen a GOP idiot insist that everyone remove their underwear when going through security. That would be a BLAST! (so to speak)