9 cm Mortar Type GR

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.

9 cm Mortar Type GR
Russian 9 cm Mortar Type GR in Army History Museum and Park in Kecel, Hungary.
Type	Gun-mortar
Place of origin	Russian Empire
Service history
Used by	Russian Empire
Wars	First World War
Production history
Designed	1915
Produced	1915–1917
Specifications
Mass	46 kg (101 lb)

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