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Webster man pleads guilty to illegally selling 3D-printed guns and a machine gun conversion device

Anthony Pietrowski, 24, admitted dealing firearms without a federal license and possessing a machine gun, prosecutors said. Sentencing is set for December.

A Webster man pleaded guilty in federal court in Worcester to illegally selling firearms, including 3D-printed guns and gun parts, and to possessing a machine gun, the U.S. attorney's office said.

Anthony Pietrowski, 24, pleaded guilty to one count of dealing in firearms without a license and one count of unlawful possession of a machine gun. U.S. District Judge Margaret Guzman set sentencing for Dec. 7. Pietrowski was arrested and charged in January and was released on conditions after a detention hearing, prosecutors said.

Between August and October 2025, prosecutors said, Pietrowski sold privately made guns and gun components in four deals in Webster. The items included a 3D-printed Glock-style pistol, several 3D-printed pistol frames and a device that converts a Glock-style pistol to fire automatically, which counts as a machine gun under federal law. He had never applied for or held a federal license to make or sell guns, prosecutors said.

In the first sale, according to the U.S. attorney's office, Pietrowski described the gun as a custom build with a 3D-printed frame, talked about how he obtained parts and assembled the weapons, and offered to supply more frames. He sold another privately made pistol along with the conversion device in August 2025, prosecutors said, and six more 3D-printed pistol frames in October 2025.

The machine gun count carries up to 10 years in prison.

This brief was drafted by AI from a public agency press release and published by The New England Signal. Why we use AI for stories like this one.

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