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The 9 cm mortar Type GR (German-Russian) was a World War I Russian mortar, developed circa 1915. It was a variant of captured Austro-Hungarian mortars 9 cm Minenwerfer M 14. 12,519 9 cm GR mortars were produced in 1915-1917 in Russia.[1] Its shell is comparable in power to the modern 81 mm mortar shell.
Comparison of Russian Front mortars (1915—1917)
| Mortar name | Calibre (mm) | Shell (kg) | Propellant mass (kg) | Muzzle velocity (metres/second) | Mass of the mortar (kg) | 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 mortar | 88.9 | grenade 1.2 | 0.4 | — | 24 | — | 400 |
| 20-mm mortar | 20 | grenade 2.45 | 0.17 | 61 | 33 | — | — |
| Likhonin mortar | 48 | bomb 3.0 | 0.34 | 16.8 | 16.5 | — | 500 |
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