QF 4-inch naval gun Mk VI, X

The QF 4-inch gun Mk VIMk VI = Mark 6. Britain used Roman numerals to denote Marks (models) of ordnance until after World War II. This was the sixth model of 4-inch QF naval gun. was an Elswick Ordnance Company (EOC) design that was used aboard a few British flotilla leaders and smaller warships during the First World War. A similar EOC gun was designated as the QF Mk X.

Mk VI gun The Mk VI was an EOC "Pattern S" gun that that served as the primary armament of the Chilean s built during the early 1910s. Four of these ships were still under construction when the war began in August 1914 and were purchased by the Royal Navy where they were known as the . Only 29 guns were built; its ammunition was incompatible with other British guns. The submarine was equipped with the gun after she was converted into a patrol boat in 1918. The was also equipped with the weapon.Friedman, p. 104Campbell, pp. 118–119

Mk X gun A single EOC "Pattern Q" gun of similar design was purchased and designated as the Mk X. It is doubtful that it was mounted on a ship.Campbell, p. 118

QF 4-inch naval gun Mk VI, X

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