The Magpul FMG-9 is a unique Submachine Gun. It features the highest rate of fire of any weapon in the game by a significant margin, the follow-up guns being the Mini Uzi, MPA10SST-X, and MG3 MK01 "Spec Ops". The weapon offers low damage to offset the extreme rate of fire, as well as low accuracy and range, making it better suited for close quarters. It features an extended 40-round magazine, although it is still insufficient in size for sustained bursts.
It features a unique Magpul Iron Sight which significantly reduces the time to scope-in.