QF 4-inch naval gun Mk VI, X
| Ordnance QF 4 inch gun Mk VI, X | |
|---|---|
| Type | Light naval gun |
| Place of origin | United Kingdom |
| Service history | |
| In service | 1913–1945 |
| Used by | United Kingdom, Chile |
| Wars | World War I |
| Production history | |
| Manufacturer | Elswick Ordnance Company |
| No. built | 29 |
| Specifications | |
| Mass | 3,136 lb (1,422 kg) |
| Length | 165.1 in (4,190 mm) |
| Barrel length | 160.1 in (4,070 mm) bore (40 calibres) |
| Shell | Separate QF |
| Shell weight | 31 pounds (14.1 kg) |
| Calibre | 4-inch (102 mm) |
| Elevation | PXI Mount +25° |
| Muzzle velocity | 2,300 ft/s (700 m/s) |
| Maximum firing range | 11,630 yards (10,630 m) at +25° |
The QF 4-inch gun Mk VI 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.