Ask Ian: Why Didn't The M3 Grease Gun use Thompson Mags?

Published on July 28, 2022
Duration: 7:55

The M3 Grease Gun's magazine design was driven by its mass-production, low-cost philosophy, mirroring the British Sten gun. Unlike the Thompson's complex T-lug system requiring milled receivers, the M3 used a simpler single-feed magazine compatible with its stamped sheet metal construction. This design choice prioritized manufacturing efficiency over inter-operability with existing Thompson magazines.

Quick Summary

The M3 Grease Gun did not use Thompson magazines due to differing design philosophies and manufacturing methods. The M3 prioritized cheap, rapid mass production with stamped metal, requiring a simpler magazine design akin to the Sten gun, unlike the Thompson's complex T-lug system which necessitated milled receivers.

Chapters

  1. 00:00Intro: M3 vs Thompson Mags
  2. 00:33M3 Design: Cheap Mass Production
  3. 01:34M3 Magazine Lineage: Sten & MP40
  4. 02:25Standard Magazine Retention
  5. 03:13Thompson Magazine Lug Explained
  6. 04:58Other SMGs Using Thompson Mags
  7. 06:43Reising & M3 Conclusion

Frequently Asked Questions

Why didn't the M3 Grease Gun use Thompson magazines?

The M3 Grease Gun was designed for cheap, rapid mass production using stamped sheet metal, which couldn't accommodate the Thompson's complex T-shaped magazine lug system. The M3 adopted a simpler magazine design, similar to the Sten gun, for manufacturing efficiency.

What was the design philosophy behind the M3 Grease Gun's magazine?

The M3's magazine design prioritized simplicity and compatibility with its stamped sheet metal construction, influenced by the British Sten gun and German MP40. This allowed for high-volume, low-cost production, a key requirement for the weapon.

How did the Thompson magazine's retention system differ from the M3's?

Thompson magazines used a complex T-shaped lug on the rear, requiring a precisely milled track in the receiver. The M3 used a simpler spring-loaded catch engaging a basic cutout on the magazine body, suitable for its stamped construction.

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