CBJ-MS
- Category
- Personal Defense Weapon
- Barrel
- 200 mm
- Weight, empty
- 2.80 kg
- Introduced
- 2000
About
What it is, and why it matters
The CBJ-MS is a Swedish selective-fire personal defense weapon developed by CBJ Tech AB and first shown in 2000. Chambered for the proprietary 6.5x25mm CBJ cartridge, which drives a saboted tungsten kinetic penetrator capable of defeating body armor, it is a blowback-operated, modular weapon broadly based on the layout of the Israeli Uzi. The CBJ-MS can fire from an open or closed bolt via interchangeable bolt groups, accepts 20-, 30-, or 100-round magazines, and can be converted to fire standard 9x19mm Parabellum.
The CBJ-MS designation stands for Carl Bertil Johansson's Modular System, named after its designer. Its 6.5x25mm cartridge fires a 4mm tungsten penetrator inside a sabot, giving a sub-caliber projectile capable of punching through NATO and CRISAT body armor at PDW ranges while remaining usable from a 9mm-sized magazine well.
The 6.5x25mm CBJ round can be retrofitted to many existing 9mm weapons via barrel and magazine changes. Saab Bofors Dynamics was involved in early production but left the project after the British declined to procure the weapon.
Specification
Everything measured
IdentityWhat it is, who built it and when.
- Manufacturer
- CBJ Tech AB
- Category
- Personal Defense Weapon
- Country
- Sweden
- Status
- In production
- Produced
- 2000
DimensionsAs issued, without a magazine or an optic.
- Barrel
- 200 mm
- Overall length
- 565 mm
- Weight, empty
- 2.80 kg
ActionHow it cycles, what trips it, and what feeds it.
- Action
- Blowback
- Firing mechanism
- Hammer fired
- Trigger
- Single action
- Capacity
- 30
- Magazine
- Detachable box
MaterialsEach swatch is the material itself, not a colour chosen to stand for it.
- Frame
- Steel
- Barrel
- Steel
- Stock
- Polymer
- Finish
- Phosphate
BallisticsFrom the service cartridge, not a handload.
- Muzzle velocity
- 830 m/s
- Muzzle energy
- 810 J
- Effective range
- 400 m
- Rate of fire
- 700 rpm
Trajectory
What the round does downrange
Solved from the muzzle figures and the bullet. The dashed rule is the effective range on the record, and the crosses are the steps the solver returned.
No load solved for this record yetThe flight path is computed from a cartridge and a bullet. This record has no ammunition filed against its chambering, so there is nothing to solve.
Features
What it has
What the record lists as fitted, drawn from the catalogue.
- Modular system
Interchangeable bolt groups
Open or closed bolt
Side folding stock- Armor piercing capability
- 9mm conversion kit
Accessory rail
Standing
How it compares
Each figure against the firearms of the same type and cartridge that record it, or of the same type where that cartridge has too few. Positions are read to the nearest tenth.
| Measurement | This firearm | Median | Position |
|---|---|---|---|
| Empty weightAmong 54 personal defense weapons | 2.80 kg | 2.23 kg | Heavier than about 80% |
| Overall lengthAmong 53 personal defense weapons | 565 mm | 582 mm | Near the median |
| Barrel lengthAmong 55 personal defense weapons | 200 mm | 168 mm | Longer than about 70% |
| Magazine capacityAmong 57 personal defense weapons | 30 | 30 | Holds more rounds than about 70% |
Answers
Questions about the CBJ-MS
How much does the CBJ-MS weigh?
The CBJ-MS weighs 2.80 kg (6.17 lb) empty.
What caliber is the CBJ-MS?
The CBJ-MS is chambered in 6.5x25mm CBJ.
How many rounds does the CBJ-MS hold?
The CBJ-MS holds 30 rounds, fed from a detachable box magazine.
How long is the CBJ-MS?
The CBJ-MS is 565 mm (22.2 in) long overall, with a 200 mm (7.87 in) barrel.
Who makes the CBJ-MS?
The CBJ-MS is made by CBJ Tech AB (Sweden). It was designed by Bertil Johansson.
When was the CBJ-MS introduced?
The CBJ-MS was introduced in 2000.
How does the CBJ-MS operate?
The CBJ-MS uses a blowback action, and its firing mechanism is hammer fired.
Compatibility
Which parts fit this firearm
Studio
Every part that mounts on this, resolved
Not a list the maker typed out: the answer comes from the mounts this firearm exposes and the interface each part needs, so it stays right when either one changes.
- Every part that mounts on any firearm in the catalogue
- Interface standards, platforms and fit overrides
- The same answers through the API and the MCP server
Requires a signed-in GunSpec account on the Studio plan. The answer is computed per part, so it is not part of the public record.
Provenance
What the record holds
Every figure above was taken from one of these pages. The confidence reflects how much of the record came from a page a claim can be checked against.
Provenance
Confidence in this record
82%
Stockists
Where to buy
Offers link straight to the shop. GunSpec never takes the order.
No shop has listed this firearm yet
Stock and prices come from the shops themselves. If you sell this firearm, you can list it and it appears here.
List a firearmMCP
Ask an assistant about it
The same record, reached the way a person asks for it rather than the way a program does.
Ask GunSpec
Works with
Point an MCP client at GunSpec and it answers from the catalogue rather than from memory. A free key covers the read tools.
API
The call that returns this record
The same fields, in the same units, from the same endpoint the page reads.
curl --request GET \ --url 'https://api.gunspec.io/v1/firearms/cbj-ms' \ --header 'X-API-Key: your_key'{ "id": "cbj-ms", "name": "CBJ-MS", "manufacturer": { "id": "cbj-tech", "name": "CBJ Tech AB", "countryCode": "SE", "foundedYear": null, "website": "https://cbjtech.com", "logoUrl": null, "description": null, "status": null, "defunctYear": null, "stateOwned": null, "makesFirearms": null, "parentId": null, "predecessorId": null, "createdAt": "2026-06-21 23:00:46", "updatedAt": "2026-06-21 23:00:46", "version": "c10d3bcee5a4c58d1da023329a078665fb90dab1fd7a6da6c5af93abae585ed5" }, "category": { "id": "personal-defense-weapon", "name": "Personal Defense Weapon", "description": "Compact firearms designed for non-frontline military personnel" }, "country_of_origin": "SE", "year_introduced": 2000, "barrel_length_mm": 200, "weight_empty_g": 2800, "action_type": "blowback"}