The Magpul FMG-9 is a unique Submachine Gun. It has very low damage, but balances this with the highest rate of fire for any weapon in the game. It also has increased damage multipliers to the limbs and an increased magazine capacity of 40 rounds, although the rate of fire is so fast that sustained fire is not ideal. Unfortunately, due to its poor range properties and mediocre accuracy, it is ineffective for longer ranges.
It features a unique Magpul Iron Sight which significantly reduces the time to scope-in.