![]() While the KRISS or the MP-9 are designs with innovations, they were designed as pistols first with added capabilities. ![]() One of the criticisms of this project was that I was “reinventing the wheel” rather than coming up with something new like the Swiss KRISS or the Brugger & Thomet MP-9. While all had advantages, the blowback design is the most robust, using simple physics of its massive bolt to contain the cartridge for just enough time to allow the bullet to exit the barrel before pulling cartridge free of the chamber. Several excellent designs exist for reliable subguns, ranging from complex locking recoil designs to gas operated and buffered designs to simple blowback designs. ![]() The lower receiver acts as a container that holds the various important parts of the firing mechanism (hammer to strike the firing pin (if applicable), the Bolt bolt (to provide a temporary wedge to the end of the barrel during firing a recoil spring mechanism to slow the bolt an ejector so that the cartridge will be ejected and a fresh cartridge fed smoothly into the chamber to be fired, repeating the cycle. The basic design of the receivers for this weapon are here:
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