Once again, stupidity reigns

and I thought better of the WSJ, but

WASHINGTON–New plastic guns made by 3-D printers could beat metal detectors and compromise security around the country, federal authorities warned Wednesday–and an expiring law could soon make them legal.

(…)

Late last year, a firearms dealer named Cody Wilson posted online instructions for how to make a gun called a “Liberator” with 3-D printing. Such weapons can use a roofing nail as a firing pin–an amount of metal so small that many metal detectors wouldn’t sense it.

Well, on and on in that vein.

But here’s the kicker:  Sure, you can get that gun on a plane.

What are you planning to use for ammunition?