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.
Design Named after CBJ Tech AB's founder and president Carl Bertil Johansson, 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 , diameter tungsten kinetic penetrator, weighing a total of with the sabot. It has a muzzle velocity of from a barrel with a muzzle energy of .
From a barrel, it has a muzzle velocity of with a muzzle energy of , and has good armor penetration out to . The standard saboted tungsten ball, when fired from a length barrel, can pierce of armor plate and leave a diameter entry hole.Brugger & Thomet’s MP9 in 6.5×25 CBJ – SAdefensejournal.com, 14 October 2011 Against the same plate, both 5.56×45mm NATO SS109 and 7.62×51mm NATO M80 failed to penetrate.Where Next For PDWs? – /www.quarry.nildram.co.uk From a barrel, the tungsten saboted round has the same trajectory as a 5.56 NATO from an M4 carbine and a velocity of at , which will penetrate CRISAT armor. 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. From a Glock pistol, the round is capable of penetrating armor plate."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
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 high-energy-transfer round that can penetrate CRISAT armor up to , and a frangible round for training and situations requiring minimal barrier penetration. A subsonic armor-piercing round for use with a suppressor weighs .
Platforms +NameYearReferenceSaab Bofors Dynamics CBJ-MSearly 2000shttps://modernfirearms.net/en/submachine-guns/sweden-submachine-guns/cbj-ms-pdw-eng/Brügger & Thomet MP92010Glock 17 rechambering kitSIG Sauer SP 2022 rechambering kitMP5K rechambering kit
References
External links A new weapon system from Sweden