T.I., whose real name is Clifford Harris, was arrested Saturday for allegedly accepting three machine guns and two silencers.
A bodyguard for Harris provided information leading to the arrest in a sting operation Wednesday.
Harris was arrested when he allegedly went to meet the bodyguard in Atlanta to pick up the guns and silencers, officials said.
Harris, 27, has a prior felony conviction for drug charges. It is illegal for convicted felons to possess firearms of any kind.
Bureau of Alcohol, Tobacco, Firearms and Explosives agents alleged they found three other guns in the vehicle Harris was driving, including a loaded weapon under the driver’s seat.
A search warrant for Harris’s home in College Park, Ga., allegedy yielded six more weapons, five of which were loaded.
The rapper is now in custody and prosecutors apparently hope to keep him there until his trial, TMZ.com said.
The magistrate will decide on Friday whether there was probable cause for Harris' arrest and whether he will qualify to be released on bail before the trial.