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“Union” was a trade name used by French and Spanish arms manufacturers (as well as American, actually) – but this particular Union is a French example. Among their many variations of pistols available (25, 32, long, short, extended barrels, etc) was a fully automatic version. For that pistol, they also developed a 35-round “horseshoe” magazine to provide maximum capacity without overly hampering the gun’s handling. These are extremely rare today, as not many were initially manufactured.
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!