6.5×25mm CBJ

Short description: Swedish pistol cartridge

6.5×25mm CBJ

Place of origin| Sweden
Production history
Manufacturer| CBJ Tech AB
Variants| CBJ
CBJ ST (spoon tip)
CBJ HET (high energy transfer)
CBJ subsonic AP
CBJ TRP (training reduced penetration)
CBJ frangible
CBJ Blank
CBJ drill[1]
Specifications
Parent case| 9×19mm Parabellum[2]
Case type| Rimless, bottleneck
Bullet diameter| 0.157 in (4.0 mm)
Overall length| 1.169 in (29.7 mm)
Primer type| Large pistol

The 6.5×25mm CBJ is a firearm cartridge designed by CBJ Tech AB, a Swedish weapon development company based in Kungsbacka, for its CBJ-MS submachine gun/personal defence weapon.

## Contents

* 1 Design
* 2 Platforms
* 3 References
* 4 External links

## Design

Named after CBJ Tech AB's founder and president Carl Bertil Johansson,[3] the 6.5×25mm CBJ has the same functional dimensions as the 9×19mm Parabellum and was designed to produce the same recoil and pressures to allow most 9 mm caliber weapons to be converted to 6.5×25mm CBJ with a simple barrel change. Also, because the 6.5×25mm CBJ has the same overall dimensions as the 9×19mm Parabellum, it can be used in the same magazines. The primary loading of the standard ball round fires a saboted 2 g (31 gr), 4 mm (0.16 in) diameter tungsten kinetic penetrator, weighing a total of 2.5 g (39 gr) with the sabot. It has a muzzle velocity of 730 m/s (2,400 ft/s) from a 120 mm (4.7 in) barrel with a muzzle energy of 533 J (393 ft⋅lb).

From a 300 mm (12 in) barrel, it has a muzzle velocity of 900 m/s (3,000 ft/s) with a muzzle energy of 810 J (600 ft⋅lb), and has good armor penetration out to 400 m (440 yd). The standard saboted tungsten ball, when fired from a 300 mm (12 in) length barrel, can pierce 9 mm (0.35 in) of armor plate and leave a 6 mm (0.24 in) diameter entry hole.[4] Against the same plate, both 5.56×45mm NATO SS109 and 7.62×51mm NATO M80 failed to penetrate.[4][5] From a 300 mm (12 in) barrel, the tungsten saboted round has the same trajectory as a 5.56 NATO from an M4 carbine and a velocity of 578 m/s (1,900 ft/s) at 300 m (328 yd), which will penetrate CRISAT armor.[4] The 6.5×25mm CBJ brass-jacketed ball rounds are heavier than similar rounds in the FN 5.7×28mm and HK 4.6×30mm.[4] From a Glock pistol, the round is capable of penetrating 7 mm (0.28 in) armor plate.[6]

There are several other 6.5×25mm CBJ bullets other than the sabot in full-caliber. Military rounds include a "spoon-tip" loading that increases the chance of the bullet to cavitate on impact and a cheap training version with a different core material. Police rounds include a 2.5 g (39 gr) high-energy-transfer round that can penetrate CRISAT armor up to 50 m (55 yd), and a frangible round for training and situations requiring minimal barrier penetration. A subsonic armor-piercing round for use with a suppressor weighs 8 g (120 gr).[4]

## Platforms

Name  | Year  | Reference

|
|

Saab Bofors Dynamics CBJ-MS | early 2000s  | [7]
Brügger & Thomet MP9 | 2010  | [4]
Glock 17 rechambering kit  |  | [8]
SIG Sauer SP 2022 rechambering kit  |  | [8]
MP5K rechambering kit  |  | [8]

## References

1. ↑ Cartridge Information retrieved 24 November 2009
2. ↑ thefirearmblog.com – The amazing 6.5x25mm CBJ
3. ↑ "CBJ Tech – About Us". http://www.cbjtech.com/about-us/.
4. ↑ 4.0 4.1 4.2 4.3 4.4 4.5 Brugger & Thomet’s MP9 in 6.5×25 CBJ – SAdefensejournal.com, 14 October 2011
5. ↑ Where Next For PDWs? – /www.quarry.nildram.co.uk
6. ↑ "6.5x25mm CBJ: Shooting Through an APC with a Glock?" YouTube, uploaded by Forgotten Weapons, 15 11 2025, www.https://www.youtube.com/watch?v=90ECrL_4GPc
7. ↑ https://modernfirearms.net/en/submachine-guns/sweden-submachine-guns/cbj-ms-pdw-eng/
8. ↑ 8.0 8.1 8.2 "the new 6.5x25 CBJ cartridge". 2023-09-10. https://www.gotavapen.se/gota/cbj/cbj_crtg.htm.

## External links

* A new weapon system from Sweden

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Modern personal defense weapons (PDWs) and cartridges

Personal defense weapons|

* AO-46
* AAC Honey Badger
* AKS-74U
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* Joint Venture Protective Carbine
* PP-19 Vityaz
* PP-2000
* PP-90M1
* QCW-05
* Saab Bofors Dynamics CBJ-MS
* SR-2 Veresk
* ST Kinetics CPW
* SIG MCX Rattler

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PDW-caliber pistols|

* FN Five-seven
* FK BRNO Field Pistol, PSD
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* Heckler & Koch UCP
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* PSA 5.7 Rock
* QSW-06
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* Ruger-57
* SR-1 Vektor

PDW cartridges|

* 4.38×30mm Libra
* 4.5×26mm MKR
* HK 4.6×30mm
* 5.56×21mm PINDAD
* 5.56×30mm MINSAS
* .224 Boz
* FN 5.7×28mm
* 5.8×21mm DAP92
* 6.5×25 CBJ-MS
* 7.5 FK
* 9×19 mm 7N31
* 9×21mm Gyurza
* 9×39mm

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