6.5 x 25 mm
Length (with folded stock)
Cyclic rate of fire
Practical rate of fire
30 - 100 rpm
20, 30, 100 rounds
Range of effective fire
up to 400 m
The CBJ MS
or Modular System is a personal defense
weapon, designed by Bertil Johanson, a Swedish arms designer, who
established a CBJ Tech AB private arms manufacturing company. This
PDW was revealed in the early 2000s. This compact weapon intended for
non-frontline troops, commanders, vehicle drivers, tank and artillery crews, pilots, medical teams
and other support personnel. Currently this weapon system is in a
final stage of development, however it received no production orders
The CBJ MS is a
blowback operated, selective fire weapon. However a replacement bolt
group can be installed and the gun will fire from a closed action.
The CBJ MS is based on the Izraeli
submachine gun. It is chambered
for a newly-developed 6.5 x 25 mm high-velocity ammunition. It is
claimed that performance of this round exceeds the standard ball 5.56 mm NATO ammunition. It
is claimed that in
some cases it outperforms even the standard ball 7.62 mm NATO
rounds. Its primary ammunition is an armor-piercing round, which
has significant armor penetration performance. During trials this CBJ round completely penetrated a standard CRISAT armored vest at a
range of 230 m. Also there is a wide range of other cartridges for
unprotected targets and training. The CBJ MS is claimed to be
superior to other personal defense weapons: the
FN P90 and
This system is excellent for close combat and self-defense. This PDW
is also effective against lightly armored vehicles.
The 6.5 x 25 mm CBJ
cartridge has roughly similar outer dimensions to the 9 x 19 mm Parabellum round. It is worth mentioning that most 9 x 19 mm pistols
and submachine guns can be re-barreled and used with the 6.5 x 25 mm CBJ ammunition.
For training the CBJ MS can use the 9 x 19 mm ammunition.
Firing mode is selected
by the pull on the two step trigger. A short pull results in single shots,
while a full-length pull results in automatic fire. There is a
manual safety button, located over the triggerguard. There is
another built-in automatic grip safety. A charging handle is located
on the back of the weapon. It is fully ambidextrous and does not
move when the gun is fired.
The CBJ Modular System
can be easily field stripped in seven parts without using any tools.
Its barrel can be easily removed for maintenance or replacement. It
is a rugged, simple design, that is claimed to be very reliable.
The magazine is inserted into
pistol grip. The CBJ MS PDW is compatible with the standard Carl
Gustaf SMG magazines. A standard box-type magazine holds 20 or 30 rounds. A
spare box magazine can be carried inserted into the front grip for
rapid reload. A
high capacity drum magazine holding 100 rounds is also available.
The CBJ MS is fitted with
adjustable open sights. A Picatinny-type rail is mounted on top of
receiver. It allows to use this weapon in conjunction with various
scopes and night vision sights. More Picatinny-type accessory rails
of the sides are optional. Also the front grip can be replace with
accessories like flashlights, laser pointers and so on.
personal defense weapon is fitted with retractable shoulder stock,
made from steel wire. It can be fitted with detachable bipod in a
light support weapon configuration. Also it can be fitted
with a sound suppressor, however it requires special subsonic
CBJ MS light
support weapon, fitted with detachable bipod and 100 round drum
magazine. In this configuration it can be used as assault weapon.