Don't Freak Out But the First 3D-Printed Metal Gun Totally Works

From the Atlantic of all places:

It reads like a plot of a dystopian novel: People develop a technology that allows them to manufacture—themselves, in the privacy of their own homes—working guns. Law enforcement is unable to regulate firearms. Chaos ensues.

When a design for The Liberator, the open-sourced and 3D-printed gun, was released last year, worriers could take some solace: The gun wasn't entirelycomposed of 3D-printed materials. The gun's firing pin—the thing, essentially, that put the fire in the firearm—was made of metal. And metal is extremely difficult to use as a material for 3D printing.
Until ... it's not. 

A company called Solid Concepts, which specializes in direct metal laser sintering, or DMLS, has created a gun, it claims, that is composed entirely of 3D-printed metal. The gun is not only fully metal-made; it is also capable of firing multiple rounds. (Liberator-style guns made of extruded plastic, on the other hand, are at this point able to fire one shot—ever.) The gun Solid Concepts is testing—and, indeed, using as a proof-of-concept—can fire 50 rounds. And be ready for more.