Sold for $18,400.
The M1907/12 heavy machine gun was the standard mounted MG of the Austro-Hungarian Empire during the First World War, and saw sporadic use clear through the end of WWII. The design is unusual among heavy machine guns because it is actually an unlocked, delayed blowback system. A combination of a heavy recoil spring and significant mechanical disadvantage is used to retard the breech to the point that extraction pressure is low enough to be safe (and extraction is aided by the use of a cartridge oiler). These are definitely underappreciated guns today, being one of the most compact and simple guns of their type.
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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!