The KSG developed by Kel-Tec is a unique shotgun feeding from two separate tubes effectively doubling its magazine. The shotgun has all of the exact same stats as the M590 but with a higher tube capacity and less effect on mobility so it effectively replaces the M590 when unlocked. Like the M590 it is an all around shotgun with no glaring weakness.

This shotgun cannot use the Ejection Port Reload although this is not an issue with the 14+1 shell capacity as in a normal mission a player will not usually use all 15 shells.