https://phys.org/news/2018-08-texan-3d-printed-gun.html

"Anyone who wants to get these files is going to get them," Wilson said, noting he can only sell to U.S. customers. "They can name their own price."

Wilson said that blueprints purchased through his company's website could be downloaded on a thumb drive and shipped to buyers by standard mail, sent by email or sent by some other secure download transfer. Some of his first sales included purchases made with crypto currency, he said.