| 9 cm Mortar Type GR | |
| Type: | Gun-mortar |
| Origin: | Russian Empire |
| Used By: | Russian Empire |
| Wars: | First World War |
| Design Date: | 1915 |
| Production Date: | 1915–1917 |
| Caliber: | 91 mm |
| Filling Weight: | Bomb 1.2 |
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.[1] 12,519 9 cm GR mortars were produced in 1915-1917 in Russia.[2] Its shell is comparable in power to the modern 81 mm mortar shell.
| 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 |