| RBL 20-pounder gun | |
|---|---|
 16 cwt field gun with limber | |
| Type | Naval gun Field gun |
| Place of origin | United Kingdom |
| Service history | |
| In service | 1859 – 19?? |
| Used by | British Empire |
| Production history | |
| Designer | W.G. Armstrong Co. |
| No. built | 412[1] |
| Variants | 13, 15 and 16 cwt[note 1] |
| Specifications | |
| Mass | Naval : 13 long hundredweight (660 kg) or 15 long hundredweight (760 kg) Field : 16 long hundredweight (810 kg)[2] |
| Barrel length | Naval : 54 inches (1.372 m) Field : 84 inches (2.134 m) bore & chamber[2] |
| Shell | 21 pounds 13 ounces (9.894 kg)[2] |
| Calibre | 3.75-inch (95.2 mm) |
| Breech | Armstrong screw with vertical sliding vent-piece (block) |
| Muzzle velocity | Naval : 1,000 feet per second (300 m/s) Field : 1,130 feet per second (340 m/s)[3] |
| Effective firing range | 3,400 yards (3,100 m) |
The Armstrong Breech Loading 20-pounder gun, later known as RBL 20-pounder, was an early modern 3.75-inch rifled breech-loading light gun of 1859.
- ^ 412 were in service in 1877 : 89 16cwt (land service), 31 15cwt & 292 13cwt (sea service). Quoted in Treatise on Manufacture of Ordnance 1877, page 150. Holley 1865, page 13 quotes 257 as at 1863 : 9 land service & 1 sea service manufactured by Elswick Ordnance, 16 land service and 231 sea service by the Royal Gun Factory. From the Report of the Select Committee on Ordnance, 1863.
- ^ a b c Text Book of Gunnery, 1887
- ^ 1130 ft/second firing a 21 lb 13 oz projectile, using 2 lb 8 oz R.L.G.2 (gunpowder) propellant. Text Book of Gunnery, 1887
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