Printing a working automatic weapon?

Tails of the Gun   Print me a Barrett M107  please “ I knew technology had passed me by when I first tried to open the child-proof cap on my aspirin—but this is ridickilus. However, thanks to a commenter I learned "The headline is an outright lie. He made a lower receiver not the entire weapon. Yet no mention of that fact in the entire article." Those bastids.  But wait! As much as I wanted this to be a parody, so as to sooth my feeling of inadequecy, -- this. “ Before you go about locking yourself in your closet, you should know that the only printed part of the gun was the lower receiver. But, according to the American Gun Control Act, the receiver is what counts as the firearm. HaveBlue reportedly used a Stratasys 3D printer to craft the part, assembled it as a .22 pistol and fired more than 200 rounds with it. The tester then attempted to assemble a rifle with the part and a .223 upper receiver but had “feed and extraction issues.” The problem may not in fact be with the 3D-printed part, though, as the issues remained when a standard aluminum lower was used. 3D printer gun designs have been floating around the Internet for some time now, but HaveBlue seems to be the first to take it to the next level. [.... a terrifying thing] ” In the final analysis, if gun ownership in any society becomes a problem, it's because that society has decayed to a point of no return. So, print me up a dozen. ”