| BL 5.5 inch Medium Gun Mk 3 | |
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BL 5.5 inch Mk 3 at The Artillery Museum of Finland
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| Type | Medium gun |
| Place of origin |
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| Service history | |
| In service | 1941-1980 (UK) |
| Used by |
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| Wars | World War II, Korean War, Yemen, Borneo Conflict, Angolan Civil War |
| Production history | |
| Produced | 1941-1945 |
| Specifications | |
| Weight | 13,647 lbs (6,190 kg) |
| Barrel length | 13 ft 9 in (4.19 m) L/30 |
| Width | 8 ft 4 in (2.54 m) |
| Crew | 10 |
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| Shell | HE shell: 100 lb (45.5 kg) and 82 lb (37 kg) |
| Calibre | 5.5 inch (140 mm) |
| Breech | Welin breech and Asbury mechanism |
| Recoil | Hydro-pneumatic |
| Carriage | Split trail |
| Elevation | -5° to 45° |
| Traverse | 30° left and right |
| Rate of fire | 2 rpm |
| Muzzle velocity | 100lb shell: 1,675 ft/s (511 m/s) 82lb shell: 1,950 ft/s (590 m/s) |
| Maximum firing range | 100lb shell: 16,200 yd (14,813 m) 82lb shell: 18,100 yd (16,550 m) |
| Sights | Probert pattern reciprocating and calibrating |
United Kingdom
France
Poland
Australia
Canada
India
Portugal
Myanmar
Iraq
Malaysia
Namibia
Oman
Pakistan
South Africa