| 203 mm howitzer M1931 (B-4) | |
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203 mm howitzer M1931 (B-4) in Great Patriotic War museum, Minsk, Belarus. |
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| Type | heavy howitzer |
| Place of origin | USSR |
| Production history | |
| Designer | Nikolai Nikititsch Magdesiew |
| Designed | 1931 |
| Produced | 1932-? |
| Number built | 871 |
| Specifications | |
| Weight | Combat: 17,700 kg (39,022 lbs) Travel: 19,000 kg (41,888 lbs) |
| Barrel length | Bore: 4.894 m (16 ft 1 in) L/24.1 Overall: 5.087 m (16 ft 8 in) L/25 |
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| Shell | HE: 100 kg (220 lbs) |
| Caliber | 203 mm (8 in) |
| Elevation | 0° to 60° |
| Traverse | 8° |
| Rate of fire | 1 round per minute |
| Muzzle velocity | 607 m/s (1,990 ft/s) |
| Maximum range | 18 km (11 mi) |
203 mm howitzer M1931 (B-4) (Russian: 203-мм гаубица обр. 1931 г. (Б-4)) was 203 mm (8 inch) Soviet heavy howitzer. These guns were used with success against heavy German fortifications and in urban combat for crushing protected buildings and bunkers.
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