''An improved version of a medium caliber twin gun mount equipped as the main armament of light cruisers and training cruisers.<br>The improved version of a naval weapon used on the seaplane sender Nisshin, the Katori-class training cruisers Katori and Kashima, and the light cruiser Yuubari. While not fit for anti-aircraft combat, they are effective as anti-ship and coast bombardment weaponry.
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''An improved version of a medium caliber twin gun mount equipped as the main armament of light cruisers and training cruisers.<br>The improved version of a naval weapon used on the seaplane sender Nisshin, the Katori-class training cruisers Katori and Kashima, and the light cruiser Yuubari. While not fit for anti-aircraft combat, they are effective as anti-ship and coast bombardment weaponry.