Williams, who's 37, was arrested in November when police pulled over a Cadillac Escalade SUV and a Dodge minibus belonging to him. Police said two guns were in one vehicle and one in the other.
Defense lawyer Charles Ross said prosecutors learned the guns were legally registered in other states to two men who were with Williams.
Ross said he was "pleased that the DA's office did the right thing."
Williams lives in Woodland Hills, Calif. He has had roles in the movies "Friday After Next" and "Norbit."
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