High Quality Content by WIKIPEDIA articles! High Quality Content by WIKIPEDIA articles! HMS M30 was a Royal Navy M29 class monitor of the First World War. The availability of ten 6 inch Mk XII guns from the Queen Elizabeth class battleships in 1915 prompted the Admiralty to order five scaled down versions of the M15 class monitors, which had been designed to utilise 9.2 inch guns. HMS M30 and her sisters were ordered from Harland

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