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In order to allow cheaper and simpler training of troops, the South African Defense Forces adopted a .22 rimfire conversion kit for their R4 rifles. The system was developed by an engineer named Willie Klotz working for Thor Engineering. It is an open-bolt firing system which is quite complex, and interestingly uses the sear of the Galil/AK fire control system to fire rather than the hammer. The conversion is rather tricky to install, and in practice often required hand-fitting each kit to a specific rifle.
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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!