Model 89 50mm Grenade Discharger
Misnamed the "Knee Mortar" by Allied Forces, who incorrectly beleived the weapon was fired from the knee.

This weapon entered the Japanese arsenal in 1929. It was a small, light weight, muzzle-fed, rifled weapon which was widely used by the Japanese Army, allowing for higly mobile mortar support by the infanrtyman - a truely unique concept that was not present in American infantry forces.

The standard projectile was a high explosive shell. Ranges were controlled by rotation of the knurled range knob. The weapon was trigger fired, and there were two range scales. One provided ranges of 120-670 meters for the use of the Model 89 HE shell. The other range was from 50-170 meters for use with the Model 91 grenade.