The FMK3 submachine gun.

The FMK3 is the current argentine army submachine gun. 

The mass distribution concept is the modern 3th generation, this mean telescopic bolt that wrap-around the barrel. In the FMK3 case the bolt, barrel and recoil spring form a group.

The gun has exceptionally balance and easy to shoot with one hand.

Dr Pedro Safier firing a FMK3 in the IPSC rifle range at TFABA

FMK3 Video clip

Notice the bolt closed.

Mr. "Colo" Zárate with his famous FMK3 in a IPSC match at Tiro Federal Argentino de Buenos Aires. 

Bolt, barrel and recoil spring group.

The trigger pack

A FMK3 exploded view.