QF 4 inch Mk XIX naval gun
| Ordnance QF 4 inch gun Mk XIX | |
|---|---|
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Crew of HMAS Cowra at gun drill, Tarakan Island, June 1945
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| Type | Dual-purpose gun |
| Service history | |
| Used by |
 Royal Australian Navy
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| Wars | World War II |
| Production history | |
| No. built | 2,023 |
| Specifications | |
| Barrel length | 160 inches (4.064 m) bore (40 calibres) |
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| Shell | Fixed QF HE, Starshell |
| Shell weight | 35 pounds (16 kg) |
| Calibre | 4-inch (101.6 mm) |
| Breech | horizontal sliding block |
| Elevation | -10° to +60° |
| Muzzle velocity | 396 metres per second (1,300 ft/s) |
| Maximum firing range | 8,870 metres (9,700 yd) at +40° |
Royal Navy Royal Canadian Navy
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 Bathurst and Castle-class corvettes and some River-class frigates in World War II, mainly against submarines.
It succeeded the higher-velocity World War I-era BL 4-inch Mk IX (typically deployed on Flower-class corvettes in the escort role). The Mk XIX fired fixed ammunition which was 38.5 inches (0.98 m) long and weighed 85 pounds (39 kg). The weight of the projectile was increased from 31 pounds (14 kg) for the Mk IX to 35 pounds (16 kg) 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.
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