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.
| 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 |
Description
editNamed 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]
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 weighs 8 g (120 gr) for use with a suppressor.[4]
Platforms
edit| Name | Year |
|---|---|
| Saab Bofors Dynamics CBJ-MS | early 2000s |
| Brügger & Thomet MP9 | 2010 |
| Glock 17 rechambering kit[6] | |
| SIG Sauer SP 2022 rechambering kit[6] | |
| MP5K rechambering kit[6] |
See also
editReferences
edit- ^ Cartridge Information retrieved 24 November 2009
- ^ thefirearmblog.com – The amazing 6.5x25mm CBJ
- ^ "CBJ Tech – About Us". Retrieved 7 November 2020.
- ^ a b c d e Brugger & Thomet’s MP9 in 6.5×25 CBJ – SAdefensejournal.com, 14 October 2011
- ^ Where Next For PDWs? – /www.quarry.nildram.co.uk
- ^ a b c "the new 6.5x25 CBJ cartridge". 10 September 2023. Archived from the original on 10 September 2023. Retrieved 19 November 2023.
External links
editThis article needs additional citations for verification. (October 2007) |