A convicted felon in Mississippi was sentenced to 14 years in federal prison after agents discovered he was making machine guns with a 3D printer, according to the U.S. Attorney’s Office in Jackson, Miss.

Kent Edward Newhouse, 41, pleaded guilty last September to two counts of being a felon in possession of a firearm and one count of engaging in the business manufacturing firearms. He was previously convicted of felony sale of controlled substances in Madison County, Miss., in 2009.

According to court documents, in April 2022, a confidential informant provided information to federal agents that Newhouse was using a 3D printer to manufacture “auto-sears,” which are firearm components used to cause semi-automatic firearms to function as fully automatic machine guns.

Federal law classifies the auto-sears themselves as machine guns.

On July 13, 2022, Newhouse sold a firearm and several auto-sears to a confidential information. One week later, a federal warrant was executed at Newhouse’s residence, where agents recovered additional firearms and auto-sears.

Federal prosecutors also obtained video footage of Newhouse operating fully-functional machine guns.

The Bureau of Alcohol, Tobacco, Firearms and Explosives, the Federal Bureau of Investigation, and the Jackson Police Department investigated the case.