9 cm Mortar Type GR
The 9 cm mortar Type GR was a World War I Russian mortar, developed circa 1915. Its shell is comparable in power to the modern 81mm mortar shell.
Comparison of Russian Front mortars (1915—1917)
| Mortar weight | Calibre in mm | Total weight of shell | Explosive shell | Muzzle velocity in metres/second | Вес Б. | Rate of fire, rounds/minute | Maximum range (metres) |
| 9 cm mortar Type GR | 91 | bomb 3.3 | 0.7 | 100 | 46 | 4-5 | 500 |
| Aasen | 75 | grenade 1.2 | 0.4 | — | 24 | — | 400 |
| 20-мм | 20 | grenade 2.45 | 0.17 | 61 | 33 | — | — |
| Lihonin mortar | 20 | bomb 3.0 | 0.34 | 16.8 | 16.5 | — | 500 |
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