Corey Gray was previously held without bond for selling a gun that ended up with one of the suspects accused in the murder of Chicago Police Officer Aréanah Preston.
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Federal prosecutors presented their case in May, stating that Gray crossed state lines to illegally sell the gun for $1,200.
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The prosecutor, Paul Schied, argued, "He made a profit by selling a weapon into Chicago's underworld."
Four teens have been charged in Preston's murder. Prosecutors said during the arrests, the weapon, connected to Gray, was found.
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The gun that was sold by Gray has not yet been identified as the specific weapon that was used to fatally shoot Preston.
A judge has order Gray to remain in custody until his November 20 sentencing date.