The CBJ-MS is the tier 6 recon submachine gun. I find it to be a decent weapon, with a few outstanding aspects. For one, the damage per shot is one of the highest in the SMG category. It does have a slightly lower rate of fire compared to many of the SMGs. The magazine size can be upgraded to 100, tied with the M960 for the highest magazine capacity in the SMG category. Its downsides are its low control and high bullet spread, making this SMG good for CQC. I outfit the gun with a reflex open scope, long barrel, silencer, drum magazine, laser, grip, and the standard stock. This allows for stealthy kills, and boosts the control and accuracy. The high damage will kill enemies quickly, and the high magazine capacity allows you to take on multiple targets.
Using the CBJ-MS limits you to short ranges only. The high spread and low control make it extremely difficult to attack targets at medium to long ranges. I advise flanking, preferably with cloak, to close distance with enemies, and spraying them down once you get close.