Interdynamic MP-9

The MP-9 came from a design that a Swedish company

Interdynamic USA was forced by the ATF to redesign the KG-9 due to its ease of being converted to full auto. At the same time as a closed bolt being designed, per the BATF, the lower plastic receiver had to be retooled to place a metal serial number tag in the side as opposed to just stamping the serial number in the plastic magazine well. This version was named the KG-99 and it is this gun that was offered in an open bolt submachine gun configuration designated the MP-9. Placed side by side, the KG-99 and MP-9 upper and lower receivers are identical with the exception that the MP-9 has a bolt hold open slot milled in the upper and the tip of the muzzle has a compensation slot cut into it. Interdynamic produced a very small quantity of registered MP-9 submachine guns due to lack of demand by the general public. The MP-9 was made in two configurations, one with select fire capability and a collapsible stock (Interdynamic MP-9), and one that is fully automatic only with no stock (K-9). Production numbers are believed to be less than 50 total, perhaps as few as 24 in select-fire with the collapsible stock. More information on this type of gun can be found here under

Imitation made illegally in Europe