CBJ-MS
CBJ-MS with extended stock.
Type	Submachine gun Personal defense weapon
Place of origin	Sweden
Production history
Designer	Carl Bertil Johansson
Designed	Early 2000s
Manufacturer	CBJ Tech AB Saab Bofors Dynamics
Specifications (6.5×25mm CBJ chambering)
Mass	2.8 kg (6.2 lb) (empty) 3.05 kg (6.7 lb) (loaded, 30-round magazine)
Length	363 mm (14.3 in) (stock retracted) 565 mm (22.2 in) (stock extended)
Barrel length	200 mm (7.9 in)
Width	44 mm (1.7 in)
Height	189 mm (7.4 in) (with 20-round magazine) 240 mm (9.4 in) (with 30-round magazine)
Cartridge	6.5×25mm CBJ 9×19mm Parabellum
Action	Open bolt, Select fire (Progressive Trigger), Blowback Operated. [1]
Rate of fire	700 rounds/min
Muzzle velocity	2,723 ft/s (830 m/s)
Effective firing range	150 m (490 ft)
Maximum firing range	400 m (1,300 ft)
Feed system	20- or 30-round detachable box magazine 100-round detachable drum magazine
Sights	Adjustable open iron sights Optical sights (Picatinny rail)

The Saab Bofors Dynamics CBJ-MS is a personal defense weapon/submachine gun designed and manufactured by Swedish weapon developer CBJ Tech AB, and was also manufactured by Saab Bofors Dynamics. It can be chambered for both 6.5×25mm CBJ and 9×19mm Parabellum cartridges via simple barrel changes.

As of 2008^[update], the CBJ-MS was supposedly in its final phases of development^{[citation needed]} but no production date had been announced.

Development

The CBJ-MS ("Modular System"^[2]) 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.

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 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 815 m/s (2,670 ft/s) 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 metres (750 ft). 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^[when?] cartridge cases are being developed using 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 effective range of the cartridge is stated to be up to 400 metres (1,300 ft).^[1]