*The U.S. government claims that Petey Pablo knew full well that he had a stolen gun in his bag when he tried to board a flight on Sept. 11, 2010, despite what he says in legal documents.

The rapper, whose real name is Moses Barrett III, was indicted by a grand jury last week after security at Raleigh-Durham International Airport discovered a Smith & Wesson 9mm pistol and ammunition in his bag last month.

The grand jury charged him with possession of a firearm by a felon, possession of a stolen firearm and attempting to take the gun onto an airplane. According to TMZ, a federal judge has issued a warrant for his arrest.

According to the docs, the grand jury claims Pablo knew he was in possession of a “concealed dangerous weapon that was and would have been accessible to him in flight.”

Pablo, however, has said it was all a mistake — insisting that he had confiscated the gun from a friend long before he packed for the airport, and simply forgot he had hidden it in his travel bag.

Pablo’s rep tells TMZ that he plans to surrender to authorities early tomorrow morning.