Between SMG and PDW: Sweden's CBJ-MS

Published on December 20, 2025
Duration: 23:10

This guide details the field stripping and reassembly process for the CBJ-MS submachine gun, as demonstrated by Ian McCollum. It covers removing the bolt carrier group, recoil spring, and stock, emphasizing a simple, robust design derived from Swedish firearms heritage. The process highlights the weapon's stamped stainless steel receiver and its compatibility with accessories like M16 bipods.

Quick Summary

The CBJ-MS is a modernized 9mm submachine gun from Sweden, developed by Bertil Johansson. It features a durable stamped stainless steel receiver, a progressive trigger, and can fire both 9x19mm Parabellum and 6.5x25mm CBJ cartridges. Designed for ruggedness, it incorporates features like a vertical foregrip with magazine storage and M16 bipod compatibility.

Chapters

  1. 00:00Introduction to the CBJ-MS
  2. 01:34Design Philosophy
  3. 03:36External Features and Accessories
  4. 04:30Magazine and Caliber
  5. 05:45Safety and Controls
  6. 08:47Trigger and Stock
  7. 10:16Disassembly and Internals
  8. 15:16Trigger Group Mechanics

Frequently Asked Questions

What is the CBJ-MS and who developed it?

The CBJ-MS is a modernized 9mm submachine gun developed in Sweden by Bertil Johansson, who previously worked with Aimpoint and developed the Viking SMG. It was designed to update the classic Swedish K (M/45).

What are the key design features of the CBJ-MS?

The CBJ-MS features a stamped stainless steel receiver, a progressive trigger for semi-auto and full-auto fire, a vertical front grip with spare magazine storage, and compatibility with M16 bipods. It was designed for ruggedness and durability.

What calibers can the CBJ-MS fire?

The CBJ-MS is chambered for the 9x19mm Parabellum cartridge and was also designed to fire the high-velocity 6.5x25mm CBJ cartridge, offering versatility in ammunition options.

How is the CBJ-MS disassembled for maintenance?

Field stripping involves removing the stock, then retracting and disengaging the charging handle to remove the bolt carrier group and recoil spring assembly. Reassembly follows the reverse procedure.

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