Since an electrical weapon needs to be safe and stable, Flickenger commissioned a fellow from the industrial-arts studio Hazard Factory in Seattle to create the housing for the Tesla gun. Using the sand-casting method, the duo made the shell of the weapon from an ordinary Nerf gun. In this image, we see a worker dumping extremely hot liquid aluminum into a container with the Nerf gun pattern. Eventually, it settles into a solidified casting. "We had a pretty good aluminum housing in a couple of evenings," Flickenger wrote on his blog.