The first 3D-printed metal gun has been made, working on the first try, and able to fire multiple rounds, unlike previous plastic models
http://www.theatlantic.com/technology/archive/2013/11/dont-freak-out-but-the-first-3d-printed-metal-gun-totally-works/281266/
If 3D-printers using metal become cheap and widespread enough, they could perhaps pose a challenge to gun control measures.
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