Yes, You Can "Print" a Gun

The technique here is not the same as plastic-printing.

A 3D printing services company has built a fully functioning, semi-automatic pistol and shown that it works just as a traditionally manufactured gun.

Built by Solid Concepts, the pistol is a replica of the storied .45-caliber, M1911 semi-automatic that served as the U.S. military’s standard-issue sidearm for more than 70 years. Solid Concept demonstrated the gun by firing 50 rounds with it.

--quoted at Just One Minute