Rapper T.I. pleaded guilty Thursday to federal weapons possession charges, and will receive a sentence that includes prison time after he completes a period of community service. In the year that he is awaiting sentencing, T.I., whose real name is Clifford Harris, must complete at least 1,000 hours of a total 1,500 hours of community service, talking to youth groups about the pitfalls of guns, gangs and drugs. He will be sentenced to serve about 12 months in prison after completing the community service, officials said. His prison time could be increased or reduced, depending on his fulfillment of the terms of the deal and good behavior, they said. Harris, 27, who was dressed in a gray business suit, told the judge he understands the terms of the agreement. He pleaded guilty to possession of unregistered machine guns and silencers, unlawful possession of machine guns and possession of firearms by a convicted felon.