The Type 100 is a double barrel machine gun of Japanese origin.

A small ammunition supply making frequent magazine loading necessary was a disadvantage, partially because of the advantages of the double barrel principle.

The magazine opening is cut out of the top of the receiver, the ejection slot out of the bottom.

The gas piston group action is based on ZB vz.

Each side has its own spring so that, in the event of a jam affecting one barrel, the other gun may continue to fire.