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In February of 1943, new production Suomi submachine guns began to include a 10-point compensator built into the barrel shroud. This pattern, really the only substantial variation in Finnish military m/31 production, was identified as the m/31 SJR, an abbreviation for muzzle brake (“suujarru”). Some earlier Suomis were modified to add the brake as well. Aimo Lahti was not a fan of the modification, and there were some complaints of snow packing to the device and freezing, causing a muzzle obstruction. So my question is, did the brake actually help make the gun more controllable? I took an opportunity at the range in Finland to try both types side by side to find out…
Also, the bonus nose-to-receiver-cap shooting technique!
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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!