Guns made of gold, that's two birds in one stone. I don't know if the bullets should be gold though, I'm guessing most of the people we shoot in the future will travel in groups and we won't have much time to retrieve the bullets from their cold, dead bodies. Also with gold in gun form, people will think twice about trying to take it. However, whenever you try to trade your gold for goods, you'll be giving someone a weapon and they might immediately turn it around on you, so there's something to mull over.
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