QF 4-inch naval gun Mk XIX

The QF 4-inch Mk XIX gun was a British low-velocity 4-inch 40-calibre naval gun used to arm small warships such as and and some in World War II, mainly against submarines.

Description

It succeeded the higher-velocity World War I-era BL 4-inch Mk IX. The Mk XIX fired fixed ammunition which was long and weighed. The weight of the projectile was increased from for the Mk IX to for the Mk XIX. The high-angle mounting used for the XIX added some anti-aircraft capability and allowed it to fire starshells to illuminate the battle area at night.

Surviving examples

On at Williamstown, Victoria, Australia.
On the parade ground at the Irish Naval Service Base, Haulbowline, Co. Cork, Ireland