Hi genkideskan,
Little more history about the gun that I have.
In Service 1943-1945
Cartridge: 37 X 111R
Muzzle Velocity 1,890 ft per second
Effective Range 900m (2,950 ft)
Weight 89kg
Length 1.52m
Developer Japan Special Steel
Known Makers: Japan Special Steel: Kokura and Nagoya Army Arsenals.