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http://tech.fortune.cnn.com/2013/05/03/first-completely-3d-printed-gun-shown/?iid=SF_F_MPM
the first 3D-printed handgun. The group, which is aiming for nonprofit status, claims the weapon can fire standard handgun rounds. The majority of the device, called the "Liberator," is fabricated entirely out of plastic, save for a nail used as a firing pin as well as a six-ounce piece of steel, intended to allow the gun to be detected by metal detectors.