Webster Man Pleads Guilty to Illegally Dealing Firearms and Possessing a Machinegun

BOSTON - A Webster, Mass. man pleaded guilty today in federal court in Worcester to illegally dealing firearms, including 3D-printed firearms and components, and possessing a machinegun.

Anthony Pietrowski, a/k/a "AJ," 24, pleaded guilty to one count of unlawful dealing in firearms without a license and one count of unlawful possession of a machinegun. United States District Judge Margaret Guzman scheduled sentencing for Dec. 7, 2026. Pietrowski was arrested and charged in January 2026 and subsequently released on conditions following a detention hearing.

Between August and October 2025, Pietrowski repeatedly sold privately made firearms and firearm components during four transactions in Webster. Among the items Pietrowski sold were a 3D-printed Glock-style pistol, multiple 3D-printed pistol frames and a machinegun conversion device designed for use with a Glock-style pistol. Pietrowski had never applied for or received a federal license to manufacture or deal firearms.

During the first transaction, Pietrowski described the firearm he sold as a custom build with a 3D-printed frame and discussed how he obtained components and assembled privately made firearms. Pietrowski also offered to supply additional frames and discussed future firearm sales. Over the following months, Pietrowski sold additional 3D-printed frames and another privately made pistol. In August 2025, Pietrowski sold a privately made pistol together with a machinegun conversion device, which constitutes a machinegun under federal law. Pietrowski later sold six additional 3D-printed pistol frames in October 2025.

The charge of unlawful dealing in firearms without a license provides for a sentence of up to five years in prison, three years of supervised release and a fine of $250,000. The charge of unlawful possession of a machinegun provides for a sentence of up to 10 years in prison, three years of supervised release and a fine of $250,000. Sentences are imposed by a federal district court judge based upon the U.S. Sentencing Guidelines and statutes which govern the determination of a sentence in a criminal case.

United States Attorney Leah B. Foley and Thomas Greco, Special Agent in Charge of the Boston Field Division of the Bureau of Alcohol, Tobacco, Firearms & Explosives made the announcement today. Valuable assistance was provided by United States Postal Inspection Service; Massachusetts State Police; and the Webster, Worcester and Warwick (RI) Police Departments. Assistant U.S. Attorney Zachary B. Stendig of the Worcester Branch Office is prosecuting the case.

This case is part of the Homeland Security Task Force (HSTF) initiative established by Executive Order 14159, Protecting the American People Against Invasion. The HSTF is a whole-of-government partnership dedicated to eliminating criminal cartels, foreign gangs, transnational criminal organizations, and human smuggling and trafficking rings operating in the United States and abroad. Through historic interagency collaboration, the HSTF directs the full might of United States law enforcement towards identifying, investigating, and prosecuting the full spectrum of crimes committed by these organizations, which have long fueled violence and instability within our borders. In performing this work, the HSTF places special emphasis on investigating and prosecuting those engaged in child trafficking or other crimes involving children. The HSTF further utilizes all available tools to prosecute and remove the most violent criminal aliens from the United States. HSTF Boston is comprised of agents and officers from HSI, FBI, DEA, ATF, USMS, IRS-CI, USPIS, DOL-OIG and DSS, as well as several state and local law enforcement agencies, with the prosecution being led by the United States Attorney's Office for the District of Massachusetts.