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The SIG 310, aka MP48, is the final evolution of SIG’s submachine gun design from the 1920s. It began as the MKM/P/S/O with a folding magazine well, wooden stock, and fancy lever-delayed operating system. Over almost 30 years of development, the wood stock and the lever-delayed system fell away, as did the really high quality finishing work. The folding magazine well and the magazine itself remained intact, however.
This final version is a very simple blowback mechanism with a similarly simple collapsing wire stock. It uses a 40-round double-feed magazine of 9x19mm ammunition, and fires at a zippy 1000 rpm. I was surprised by just how easily controllable it was despite the high rate of fire and short receiver – and also by the harmonic ringing of the wire stock when firing. While this may be an embarrassingly crude gun for the Swiss, it is a gun that most other countries would be quite proud of.
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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!
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