| Ordnance QF 4 inch gun Mk XVI | |
|---|---|
 Twin Mk XVI on HMCS Haida | |
| Type | Naval gun Naval anti-aircraft gun |
| Place of origin | United Kingdom |
| Service history | |
| In service | 1936-[1]-1950s |
| Used by | Royal Navy Royal Canadian Navy Royal Australian Navy South African Navy Royal Malaysian Navy |
| Wars | World War II Korean War Suez Crisis |
| Production history | |
| No. built | 2,555 |
| Variants | Mk XVI* and Mk XXI[2] |
| Specifications | |
| Mass | Barrel & breech 4,495 lb (2,039 kg) |
| Barrel length | 180 inches (4,572 mm) (45 cal) |
| Shell | Fixed QF 35 pounds (15.88 kg) HE 38.25 pounds (17.35 kg) S.A.P. |
| Calibre | 4-inch (101.6 mm) |
| Breech | vertical sliding-block |
| Recoil | hydro - pneumatic 831 millimetres (33 in) |
| Elevation | mounting dependent (-10 to 80 deg on H.A. twin mark XIX mount)[3] |
| Traverse | mounting dependent |
| Rate of fire | 15–20 rounds per minute[4] |
| Muzzle velocity | 2,660 feet per second (811 m/s) |
| Maximum firing range | 19,850 yards (18,150 m) at 45 degrees elevation AA Range: 39,000 feet (11,890 m) at 80 degrees elevation[4] |
| Filling weight | 9 pounds (4.08 kg) |
The QF 4 inch Mk XVI gun[note 1] was the standard British Commonwealth naval anti-aircraft and dual-purpose gun of World War II.
- ^ "British 4"/45 (10.2 cm) QF HA Marks XVI, XVII, XVIII and XXI". NavWeaps. Retrieved 25 August 2008.
- ^ Campbell, Naval Weapons of WWII, p.56.
- ^ "THE 4-in. Q.F. MARK XVI* GUNS ON THE H.A. TWIN MARK XIX MOUNTING". maritime.org. Retrieved 25 August 2008.
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