 BL 6-inch Mk XI naval gun

The BL 6-inch Mark XI naval gun was a British 50 calibres high-velocity naval gun which was mounted as primary armament on cruisers and secondary armament on pre-dreadnought battleships from 1906 onwards.The gun with its increased length of 50 calibres gave improved firepower over the current 6-inch Mk VII gun of 45 calibres.