There are 5 submachine guns in Call of Duty Black Ops 4 to consider to find out which one is the best. The MX9 is a strong early unlock that is well suited to flanking enemies and taking them by surprise. The GKS is a lower fire rate, higher damage submachine gun that is competitive with assault rifles at medium range and can be used to push an objective head on.
The Spitfire is the highest fire rate submachine gun with controllable recoil. It is very strong at close range and can be used at medium range to a degree. The Cordite submachine gun has the largest ammo supply and can be used to go at it alone behind enemy lines as a result of its versatility.
The Saug 9mm is the last submachine gun you unlock and is best suited to flanking enemies and taking them by surprise.
The main weaknesses of the Saug 9mm are the low damage at medium range that mean you have little chance against assault rifles and the low ammo supply. The GKS is good at competing against assault rifles but doesn’t fit the submachine guns role of close range superiority due to its low fire rate.
The MX9 is a well balanced submachine gun but it doesn’t stand out in any way that makes it better than the other submachine guns.
The Cordite is a close second due to its versatility which lets you use it to attack an objective or flank enemies without having to worry about running out of ammo or being outclassed by assault rifles. However, the Spitfire with its high fire rate and quick time to death, stands out as a very powerful gun. With it enemies have little chance at close range. As an added bonus the wildfire operator mod is a lot of fun and makes you near unbeatable at close range, although it does make the Spitfire difficult to control at medium range. Therefore, the Spitfire is the best submachine gun in Call of Duty Black Ops 4.