S10 weapon balance (I found this in Leakers on Duty discord, so it might be legit). Not only dev nerf MX9, they even buff MW11 to 3-shot kill. : r/CallOfDutyMobile
Black Ops 4: Full stats and best class setups for GKS and MX9 SMG weapons in Multiplayer - Dexerto
Best class setups & tips for the MX9 in Black Ops 4 Multiplayer - Charlie INTEL
they "BUFFED" this weapon... 😂 (Black Ops 4 MX9 Buff) - YouTube