The CBJ-MS (Modular System) is a submachine gun of Swedish origin. Designed and manufactured by Swedish weapon developer CBJ Tech AB, and was also manufactured by Saab Bofors Dynamics. It can be chambered for both 9×19mm Parabellum and higher-velocity 6.5×25mm CBJ cartridges via simple barrel changes. Quite similar to the Uzi for having open bolt mechanism and grip-inserted magazine.