Swedish K Comparison: Model m/45 v m/45B

Published on April 25, 2022
Duration: 5:54

This guide details how to identify differences between the Swedish K m/45 and m/45B submachine guns, focusing on visual cues like finish, magazine well, barrel shroud, and receiver components. The analysis is presented with high authority by Ian McCollum, highlighting key modifications made for improved durability and reliability in the m/45B.

Quick Summary

The Swedish K m/45B, adopted in 1954, is an improved variant of the original m/45. Key differences include a more durable green painted finish, a permanently riveted magazine well for enhanced reliability with 36-round magazines, smaller vent holes on the barrel shroud to prevent bending, and a reinforced receiver end cap with a spring buffer to handle higher-pressure ammunition.

Chapters

  1. 00:00Introduction to Swedish K
  2. 01:02Adoption and Finish Comparison
  3. 01:26Magazine Well Evolution
  4. 02:50Barrel Shroud Modifications
  5. 03:12Receiver and Buffer Upgrades
  6. 04:54Other Variants and Conclusion

Frequently Asked Questions

What are the main visual differences between the Swedish K m/45 and m/45B?

The m/45B typically has a green painted finish over its parkerizing, unlike the m/45's grey finish. Additionally, the m/45B features smaller vent holes on its barrel shroud and a permanently riveted magazine well, contrasting with the m/45's larger vents and detachable magazine well.

Why was the m/45B developed with a permanently riveted magazine well?

The m/45B's permanently riveted magazine well was an improvement over the m/45's detachable version. This change enhanced reliability, particularly when using the standard 36-round stick magazines, and addressed issues associated with the earlier model's compatibility with larger quad-stack magazines.

What upgrades did the m/45B receive for improved durability?

The m/45B incorporated several durability upgrades, including a more robust spring buffer and reinforced rear end cap to handle higher-pressure ammunition. Its barrel shroud also featured smaller vent holes to prevent bending, and the overall finish was improved with green paint over parkerizing.

Are the Swedish K m/45 and m/45B considered C&R eligible?

Yes, according to the video, both the m/45 and m/45B examples discussed are noted as being fully transferable and C&R (Curios & Relics) eligible, making them of interest to historical firearm collectors.

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