Koizumi Type 4 submachine gun

The  Type 4 SMG  (四式機関短銃) was a Japanese submachine gun chambered 8mm Nambu or 9mm Luger. The Type 4 was used extensively by the Japanese Revolutionary Movement due to its low production cost.The Type 4 had wooden stocks and was also used by the Imperial Japanese Army and Navy, however it was issued in smaller numbers.