From the BL Mark I of 1916, the 4.7 inch gun (119 mm) was the mid-calibre weapon of choice for the Royal Navy, used particularly on destroyers.
The majority of new escort vessels built for the Royal Navy in the 1950s and 1960s carried at least one Mark 6 mounting, with two in the Salisbury class frigate and County classdestroyer and three in the Daring classdestroyer.
The Type 81 Tribal class frigates were an exception, using reconditioned Mark V mounts from scrapped C classdestroyers that were fitted with RPC and known as the Mark 5* Mod 1.
Despite the vulnerability of the boiler layout, the design was to prove compact, strong and very successful, forming the basis of all Royal Navy destroyer construction from the O class up to the Crclass of 1944.
The "N" class were ordered in 1940 as repeats of the "J" design, after delays and cost over-runs associated with the larger and more complicated "L and M" class.
The high-speed destroyer mine sweeps were replaced with a rack and two throwers for 45 depth charges and Radar Type 286 air warning was added at the masthead alongside Radar Type 285 fire control on the H/A rangefinder-director.
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