Police say the suspect had a ghost gun, possibly made with a 3D printer, when he was arrested on Monday. Here's what to know about the increasingly widespread weapons and efforts to regulate them.

The Walther PPK/S 9 millimeter short. It's been coded to your palm print, so only you can fire it. Less of a random killing machine, more of a personal statement.” ...

Like the Walther P-38 the slim metal, single stack magazine held eight rounds of 9-millimeter Parabellum. During the 1960s the CIA had experimented on a suppressor for the Walther P-38, a pistol w ...