BL 4-inch Mk I–VI naval gun
| Ordnance BL 4-inch gun Mk I – Mk VI | |
|---|---|
| Type | Naval gun |
| Place of origin | United Kingdom |
| Service history | |
| In service | 1880s – 190? |
| Used by | United Kingdom |
| Specifications | |
| Barrel length | Mk I 22.5cwt : 100 inches (2.540 m) bore (25 calibres) Mk II – VI : 108 inches (2.743 m) bore (27 calibres) 120 inches total |
| Shell | 25 pounds (11.34 kg) |
| Calibre | 4-inch (101.6 mm) |
| Breech | 3-motion screw |
| Muzzle velocity | Mk I 13cwt : 1,180 feet per second (360 m/s) Mk II – VI : 1,900 feet per second (580 m/s) |
| Maximum firing range | Mk II-VI 7,700 yards (7,000 m) |
The BL 4-inch gun Mk I – Mk VI were a family of early British breech-loading 4-inch naval guns.