QF 4-inch naval gun Mk XIX
| Ordnance QF 4 inch gun Mk XIX | |
|---|---|
Crew of HMAS Cowra at gun drill, Tarakan Island, June 1945 | |
| Type | Dual-purpose gun |
| Service history | |
| In service | 1939 |
| Used by | Royal Navy Royal Canadian Navy Royal Australian Navy |
| Wars | World War II |
| Production history | |
| Designed | 1938 |
| No. built | 2,023 |
| Specifications | |
| Barrel length | 160 inches (4.064 m) bore (40 calibres) |
| 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° |
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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 corvette and some River-class frigate in World War II, mainly against submarines.