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.
| 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) |
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 edit
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]
References edit
- ^ a b Saab Bofors Dynamics CBJ MS personal-defence weapon (Sweden), Sub-machine guns
- ^ "CJB Tech - Small Arms". Retrieved 2020-11-07.