http://www.forgottenweapons.com
John Browning’s Auto-5 long recoil shotgun was the first mass-produced semiauto shotgun, and would eventually become the second best-selling semiauto shotgun in the world (not bad for the first one to hit the market). It was patented in 1900 and initially manufactured by FN in Belgium, with Remington starting production in 1905. This particular one is in 12 gauge.
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!