A history of the 30mm ADEN gun, its development, ammunition and installation. Includes the functioning of the gun and details the aircraft it was used in. The book contails a facimile of the Royal Air Force Air Publication on the Armament Installation from the Hawker Hunter AP4347B Vol.1, Sect.7, Chap.1-3 and the chapters from Chinn's ""The Machine Gun"" referring to the Revolver cannons; MG213C, ADEN gun and DEFA gun. This is a book for the military historian and the enthusiast alike who want to know a little more about this weapon which has seen service with the worlds air forces for over half a century and still continues to serve.