Doomsday Gun (1994)

Dr Gerald Bull was a genius at designing and building superguns. (Very large long range guns capable of shooting more than 100 Miles.) When a plan by the CIA to export restricted material using him was exposed, the CIA denied all knowledge and he went to jail. He was later released to help Saddam Hussein build a new supergun capable of firing over 500 miles. Israel, upon learning of the supergun, fears it would be used against themselves.