“Download this gun”: 3D-printed semi-automatic fires over 600 rounds | Ars Technica
The white portion of this AR-15, known as the "lower," was manufactured using 3D printing. Defense Distributed Cody Wilson, like many Texan gunsmiths, is fast-talkin’ and fast-shootin’—but unlike his predecessors in the Lone Star State, he’s got 3D printi...