Saab Bofors Dynamics CBJ-MS

The Saab Bofors Dynamics CBJ MS is a personal defense weapon/submachine gun designed and manufactured by CBJ Tech AB; it was also manufactured by Saab Bofors Dynamics. It can be chambered for both 6.5×25mm CBJ and 9×19mm Parabellum cartridges.

A CBJ MS with a 30-round magazine
TypeSubmachine gun
Personal defense weapon
Place of originSweden
Production history
DesignerCarl Bertil Johansson
DesignedEarly 2000s
ManufacturerCBJ Tech AB
Saab Bofors Dynamics
Specifications (6.5×25mm CBJ chambering)
Mass2.8 kg (6.2 lb) (empty)
3.05 kg (6.7 lb) (loaded, 30-round magazine)
Length363 mm (14.3 in) (stock retracted)
565 mm (22.2 in) (stock extended)
Barrel length200 mm (7.9 in)
Width44 mm (1.7 in)
Height189 mm (7.4 in) (with 20-round magazine)
240 mm (9.4 in) (with 30-round magazine)

Cartridge6.5×25mm CBJ
9×19mm Parabellum
ActionOpen bolt, Select fire (Progressive Trigger), Blowback Operated. [1]
Rate of fire700 rounds/min
Muzzle velocity2,723 ft/s (830 m/s)
Effective firing range150 m (490 ft)
Maximum firing range400 m (1,300 ft)
Feed system20- or 30-round detachable box magazine
100-round detachable drum magazine
SightsAdjustable open iron sights
Optical sights (Picatinny rail)


The CBJ MS was first shown in August 2000. It is an unusual weapon in several respects, not least because it is meant to fulfill the roles of personal defense weapon, assault rifle and, with the addition of a proprietary bipod and 100-round drum magazine, squad automatic weapon. The gun features a top-mounted Picatinny rail for mounting optics, a progressive trigger for semi-and full 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 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 cartridge; but by simply changing the barrel, it can fire 9×19mm Parabellum ammunition for police, training and other operations. The 6.5×25mm CBJ cartridge has the same overall dimensions as the 9×19mm cartridge and generates the same level of firing impulse. The projectile is a tungsten insert held in a plastic sabot, fired at a high muzzle velocity (815 m/s, 2,670 ft/s) with the ability to defeat current and future body armours. It is claimed to be effective against lightly armoured vehicles such as 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. The cartridge case is aluminium. Each 6.5×25mm CBJ cartridge weighs 4.5 grams (0.16 oz) and has an overall length of 29.7 millimetres (1.17 in). The projectile weight is 2 grams (0.071 oz). The combat range of the cartridge is stated to be up to 400 metres (1,300 ft).[1]


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