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. The Weapon features a top-mounted Picatinny rail for mounting optics, a progressive trigger for semi- and fully automatic fire, a collapsing wire buttstock, a grip safety, a threaded barrel, and a hollow Vertical Foregrip which can be used to hold a spare magazine. The feed system comes in 20 or 30-round detachable box magazine and 100-round drum one.