    Sentence It Kenneth " Supreme " McGrifi  was sentenced to 37 months in prison for  illegally ‘possessing a handgun as a  convicted felon at a firing range in  Maryland    Sentence 2 Kenneth "Supreme " McGriff  was sentenced to 37 ‘months by U.S.  District Judge 3. Frederick Motz. for  illegally possessing a handgun as a  convicted felon at a Maryland firing  range.