INERT DEACTIVATED. The British 20mm Hispano-Suiza (20x110) HS 404 aircraft cannon which first entered service experimentally in the Battle of Britain in 1940 arming several Supermarine Spitfires and also in the Bristol Beaufighter which carried 4 of the guns internally. The gun however with its original 60 round drum feed although very effective in combat was mechanically unreliable. The gun was later modified to a belt feed which was reliable and served in many aircraft throughout WW2 including the Supermarine Spitfire, Hawker Hurricane, Westland Whirlwind, Bristol Beaufighter, Hawker Typhoon and Tempest as standard equipment or an upgrade of the Browning .303 machine gun as an effective hard hitting gun. The round was later used in the De Havilland Vampire and Gloster Meteor fighter aircraft after World War 2. This is a Hispano HS 404 aircraft inspection round manufactured by Kynoch. The round has a nickel plated brass cartridge case with a blind primer pocket which is crimped onto a steel copper driving banded ball projectile which retains most of its original white painted finish. The round is headstamped K (Kynoch manufacture) and has a blind nickel plated primer hole. The price includes U.K. delivery and no licence is required to possess inert rounds in the UK if retained as part of a collection or display. O 2224