The Swedish Suomi M-37/39 Submachine Gun


When the Swedish military decided that 1937 seemed like a pretty good time to be getting some new submachine guns, they arranged to purchase a version of the m/31 Suomi from their Finnish neighbors – which they called the M-37. Since the standard Swedish military pistol (the Husqvarna m/07) was chambered for the 9x20mm Browning Long cartridge, they got a version of the Suomi chambered for that round. It used a rearward-sloping (to prevent rimlock) quad-stand magazine that held 56 rounds.

Shortly after this purchase, however, Sweden bought a number of other foreign-made guns, including Walther HP pistols and German submachine guns in 9mm Parabellum. This was a more powerful and more modern cartridge than the 9×20, and so the followup licensing of Suomis reverted to 9mm Parabellum as well, with the designation M-37/39. While the basic mechanism of these is identical to the Finnish Suomi, they differ in some details, including barrel length, charging handle contour, and stock profile.


    • If Ian had one of those daft social media thumbs up things on his site, I would have used one. When Finland beats Sweden at ice hockey Finland’s birthrate increases 9 months later, and Sweden pretends it didn’t happen.

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  2. That spring is relatively stiff (small diameter), hence the high rate of fire. MP38/40 is little more advanced in that way. The gun is certainly solid built – like Volvo.

  3. “9×20”
    It was also used in A.T. (Arsenal Tallinn) which was derivative of Swiss Brevet Bergmann sub-machine gun:
    if I understand correctly (translator) it has two stage trigger (shallow squeeze – single, deep – auto)
    Estonian forces also later decided to bought SUOMI sub-machine gun in 9×19, but producer of this sub-machine gun redesigned it for 9×19 to compete (prototype was build), but further development stopped after Soviet occupation.

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