Looks like a fully plastic gun is about to become a reality. Barrels and some other parts have always had to be metal, but Defense Distributed has recently made a pistol that only uses 2 metal pieces - the firing pin and a non-functional piece to make it legal.
The world's first gun made up almost entirely of 3D-printed components has been created, Forbes reports. The firearm, called the "Liberator," is a small pistol-like weapon that can shoot various types of handgun bullets through several interchangeable plastic barrels. It's still a prototype for now and reportedly has not been tested — yet. But that's coming soon, according to its creators at Defense Distributed, an Austin, Texas-based collective of gun access advocates led by crypto-anarchist Cody Wilson. The group told Forbes that once the gun has been tested and proven to be functional, they will publish the digital blueprints for it on their website, Defcad.org, allowing anyone to make it.
http://www.theverge.com/2013/5/3/429658 ... t-fully-3d