| 28 cm MRK L/40 | |
|---|---|
 The Ottoman battleship Barbaros Hayreddin or Turgut Reis | |
| Type | Naval gun Railway gun Coastal artillery |
| Place of origin | German Empire |
| Service history | |
| Used by | German Empire Ottoman Empire Chile China |
| Wars | Boxer Rebellion World War I |
| Production history | |
| Designer | Krupp |
| Manufacturer | Krupp |
| Specifications | |
| Mass | 44 t (43 long tons; 49 short tons) |
| Length | 11.2 m (36 ft 9 in) L/40 |
| Barrel length | 10.4 m (34 ft 1 in)[1] |
| Shell | Separate-loading, bagged charge and projectile |
| Shell weight | 240 kg (530 lb) |
| Caliber | 283 mm (11.1 in)[1] |
| Breech | Horizontal sliding-wedge |
| Elevation | -5° to +25° |
| Traverse | -150° to +150°[2] |
| Rate of fire | 1 round every two minutes |
| Muzzle velocity | 715 m/s (2,350 ft/s) |
| Effective firing range | 11 km (6.8 mi) at 25° |
| Maximum firing range | 15 km (9.3 mi) at 25°[1] |
The 28 cm MRK L/40 was a German naval gun that was used in World War I as the primary armament of the Brandenburg-class pre-dreadnought battleships. Some were also converted to railway guns during World War I.