Cool Forgotten Weapons merch! http://shop.bbtv.com/collections/forgotten-weapons
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-stack 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.
At Forgotten Weapons I think the most interesting guns out there are the most obscure ones. I try to search out experimental and prototype weapons and show you how they work, in addition to more conventional guns that you may not have heard of before. You’re much more likely to find a video on the Cei Rigotti or Webley-Fosbery here than an AR or Glock. So, do you want to learn about something new today? Then stick around!