Interdynamic MP-9 (ser # less than 00025). This is the select-fire SMG that started it all, in reference to the KG-99 and TEC-9's semi auto pistols that followed. The closest thing to this gun would be the KG-9 open bolt semi auto. The stock is original and it runs about 1000 rpm with 115gr ammo.
Submitted by: John in Ohio