United States Attorney Jan Sharp announced that Riley Griffy, 29, of Omaha, Nebraska, was convicted today in federal court in Omaha of unlawful possession of a machine gun.

United States Chief District Judge Robert F. Rossiter, Jr. sentenced Griffy to 57 months in prison. After completing his prison term, Grify will begin a 3-year period of supervised release.

On April 15, 2021, Griffy sold a 3D-printed conversion device that converted a semi-automatic Glock pistol into an automatic weapon. Griffy used a 3D printer to build the device, which is a machine gun under federal law.

Griffy continued to illegally manufacture machine guns that converted firearms into automatic weapons until his arrest on June 2, 2021. In total, Griffy manufactured and sold nine machine guns and one silencer.

This case was investigated by the Omaha Police Department, Federal Bureau of Investigation, and Bureau of Alcohol, Tobacco, Firearms and Explosives, and was part of Project Safe Neighborhood.