Russia's new multi-barrelled anti-aircraft gun demonstrated in Moscow . Russia's latest weapon devised for use against invading aircraft and multiple barrelled quick firing gun was demonstrated for high officials at an air display in Moscow . The gun was brought into action when a fleet of reading aircraft flew over and attempted to bomb the aerodrome . Photo shows the new multiple barrelled anti - aircraft gun repulsing an air attack at the Moscow aerodrome during the demonstrations . 13 September 1936