DAVENPORT, Iowa – A Rock Island man was sentenced to 48 months in federal prison for illegally possessing a machine gun.

According to public court documents and evidence presented at sentencing, in February 2025, Juwan Attron Johnson, 28, also known as “Chubbs,” possessed a machine gun conversion device. Machine gun conversion devices, commonly referred to as “switches,” convert a semi-automatic firearm into a fully automatic firearm that fires multiple shots with a single pull of the trigger. Machine gun conversion devices are classified as machine guns under federal law and are illegal to possess. Johnson is also prohibited from possessing firearms and ammunition because he is a felon, including a 2017 conviction for voluntary manslaughter.

After completing his term of imprisonment, Johnson will be required to serve a two-year term of supervised release. There is no parole in the federal system.

United States Attorney David C. Waterman of the Southern District of Iowa made the announcement. This case was investigated by the Davenport Police Department.

This case is part of Project Safe Neighborhoods (PSN), a program bringing together all levels of law enforcement and the communities they serve to reduce violent crime and gun violence, and to make our neighborhoods safer for everyone. On May 26, 2021, the department launched a violent crime reduction strategy strengthening PSN based on these core principles: fostering trust and legitimacy in our communities, supporting community-based organizations that help prevent violence from occurring in the first place, setting focused and strategic enforcement priorities, and measuring the results. For more information about Project Safe Neighborhoods, please visit Justice.gov/PSN.