Looks like Gucci Mane's prison stay may be a little -- two decades or so -- longer than originally planned. CNN reports that the troubled rapper -- who is currently serving six months for probation violations and still releasing music -- was charged in federal court today with two counts of possessing a firearm as a felon. Police picked him up for disorderly conduct, possession of marijuana and carrying firearm on September 14, just few days after he had been found in possession of a different firearm, and a few more since he had been dropped by Atlantic Records on account of increasingly erratic behavior. Each charge carries a penalty of up to ten years in federal prison and fines up to $250,000, meaning Guwop's looking at up to two decades and $500,000 in fines if convicted. His next court hearing is scheduled for early January.