The Walther MP was an all-stamped submachine gun developed in the late 1950s, and available in long (MPL) and short (MPK) versions. It is an open-bolt, blowback design, but uses a somewhat innovative bolt in which most of the mass is located above and in front of the chamber, to reduce bolt travel and receiver length. I found it to be a very pleasant gun to shoot, and I suspect it was largely unsuccessful in large part due to the superior marketing skills of H&K with their MP5 submachine gun.
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!