 The guns were known as the Rexer or DDRS and exported worldwide.The Imperial Russian Army bought 1,250 Madsens for the cavalry and deployed them during the Russo-Japanese War.The Imperial Russian Air Service used Madsens to equip their Morane-Saulnier G and Morane-Saulnier L monoplanes, and as its open bolt firing cycle made it difficult to fire through a propeller, the Madsen's gun mounting had to fire over the propeller.