A Cape man will spend the next four years in federal prison for illegal gun possession.  33-year-old Zadrin Nunley was sentenced Thursday in U-S District Court to 56 months on one felony count of being a prior felon in possession of a firearm.  He admitted to owning a 45-caliber pistol with one round in the chamber during an assault at a Cape house in September 2011.  Officers seized his pistol and eight rounds in the magazine.  Nunley has prior felony convictions for cocaine possession with the intent to distribute.