Saab Bofors Dynamics CBJ-MS

• Name — CBJ-MS • Origin — Sweden • Type — Submachine gun Personal defense weapon • Is Ranged — yes • Designer — Carl Bertil Johansson • Design Date — Early 2000s • Manufacturer — CBJ Tech AB Saab Bofors Dynamics • Weight — (empty) (loaded, 30-round magazine) • Length — (stock retracted) (stock extended) • Height — (with 20-round magazine) (with 30-round magazine) • Cartridge — 6.5×25mm CBJ 9×19mm Parabellum • Action — Blowback, open bolt • Rate — 700 rounds/min • Feed — 20- or 30-round detachable box magazine 100-round detachable drum magazine • Sights — Adjustable open iron sights Optical sights (Picatinny rail)

The CBJ-MS ("Modular System") was first shown in August 2000. It is an unusual weapon in several respects, not the least because it is meant to fulfill the roles of a personal defense weapon, an assault rifle and (with the addition of a proprietary bipod and 100-round drum magazine) a squad automatic weapon. Saab Bofors was involved in the production of the CBJ-MS, but left the project after the British did not see an interest to potentially acquire the submachine gun.

The gun features a top-mounted Picatinny rail for mounting optics, a progressive trigger for semi- and fully automatic fire, a collapsing wire stock, a grip safety, a threaded barrel, and a hollow foregrip which can be used to hold a spare magazine. The mechanism is based on the Uzi. It can be equipped with optical sights on the picatinny rail. The CBJ-MS is capable of being field-converted to fire one of two types of ammunition. For the purely military role, the weapon fires the proprietary 6.5×25mm CBJ PDW cartridge; but by simply changing the barrel, it can fire 9×19mm Parabellum ammunition for law enforcement, training and other security operations. The 6.5×25mm CBJ cartridge has the same overall dimensions as the 9×19mm cartridge, can be used in the same magazines and generates the same level of recoil. The projectile used by the 6.5×25mm CBJ can be a normal ball bullet, but can also be a 4 mm tungsten kinetic penetrator held inside a non-disintegrating plastic sabot, fired at a high muzzle velocity of with the ability to defeat most contemporary body armours. It is also claimed to be effective against light vehicle armors on armoured personnel carriers (APCs). Advantages claimed for the 6.5×25mm CBJ cartridge include a high impact velocity, a high hit probability due to the flat trajectory, high energy transfer to the target, and low levels of barrel wear and corrosion. During trials, the 6.5×25mm CBJ round completely penetrated through the standard CRISAT vest at a range of 230 m. It is claimed that it is superior than the 5.7x28mm FN and 4.6×30mm HK round out of the FN P90 and HK MP7. Current cartridge cases are being developed using aluminium. Each 6.5×25mm CBJ cartridge weighs 4.5 g and has an overall length of 29.7 mm. The projectile weight is 2 g. The effective range of the cartridge is stated to be up to 400 m.