In Japan, the law is butting heads with technology. Japan has very strict hand gun laws, so it came as no surprise that Yoshitomo Imura, 27, was arrested Thursday on a charge of illegal weapons possession.

Imura used a 3-D printer to manufacture 5 hand guns, two of which can fire real bullets.

Imura, an employee of Shonan Institute of Technology in Fujisawa, posted footage of the guns as well as production blueprints online. He did not think he was doing anything illegal.

And we are talking powerful weapons. One of the guns could fire through more than 10 plywood boards stacked together.

It is not clear where Imura got the designs for the guns. But it comes a year after Cody Wilson posted designs he made for the first printed hand gun. Imura's designs, including one that looks like a revolver, appear to be different from Wilson’s weapon.