By: Dan Zimmerman
Unlike previous 3D-printed gun models, it is a semi-automatic weapon. “It was revolutionary,” says Dr Rajan Basra, a researcher from King's College London who studies 3D-printed weapons. The FGC-9 is now thought to be the most popular 3D-printed weapon in the world. It is particularly difficult to police, given that it doesn't involve illegal parts. As Basra says, “You can't regulate a steel tube or a spring.”