Type 89 grenade discharger
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The Type 89 grenade discharger, inaccurately and colloquially known as a knee mortar by Allied forces, is a Japanese grenade launcher or light mortar that was widely used in the Pacific Theater of World War II. Wikipedia
Barrel length: 254 mm (10 in)
Cartridge: 793 g (1 lb 12 oz)
Effective firing range: (Type 89 shell): 120 m (131 yd)
Place of origin: Empire of Japan
Rate of fire: 25 rpm