From El Reg
People are missing one important point about the "Liberator" 3D-printed "plastic gun": it isn't any more a gun than any other very short piece of plastic pipe is a "gun".
You can take my Liberator ... and shove it
Seriously. That's all a Liberator is: a particularly crappy pipe, because it is made of lots of laminated layers in a 3D printer. Attached to the back of the pipe is a needlessly bulky and complicated mechanism allowing you to bang a lump of plastic with a nail in it against the end of the pipe.