11 Replies to “An opinion about the State Department’s reaction to the 3D Printed gun….”

        1. Think about it, it’s a SMG in 9mm, as long as you have a 10 or 12 inch (or more) barrel you don’t need any other action system then blowback.

          Blowbacks consist of barrel, trigger, bolt, buffer/return spring, and firing pin. The only hard part to making a Sten would be fabricating the trigger system. But I think you could do with just having the trigger mechanism physically block the forward motion of the bolt before it closes, so you don’t have to worry about a spring loaded firing pin by just always having the firing pin exposed and out far enough that whenever the bolt closes it fires the round. Or just have a heavy firing pin that tapers from small to large inside the bolt and let it free float. When you pull the trigger the bolt moves forward, because of inertia the firing pin moves reward, when the bolt stops moving forward the pin moves forward due to inertia causing the round to go off, then the force of the round firing pushes the bolt back and it repeats. Because it’s bigger in the back it cant fly out of the small hole.

          At least that’s what I think. I am not a gunsmith. I might be completely wrong.




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  1. Being a curious mechanical engineer I’ve always wanted to see a complete set of blueprints for the M2A1, a STEN or a Swedish K. Something so cheap and simple as to be almost an “every man’s SMG”. Not that I don’t appreciate good craftsmanship,machining and tooling.




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  2. With a “powerful” round, like the 9mm, for a simple blowback subgun you need what is called advanced primer ignition, i.e. the round is fired as the round is being chambered, the bolt still having forward momentum. (If you can’t figure out why, you should not try this at home.) That’s likely the most precise and critical calculation, how much the fixed firing pin protrudes from the bolt face.




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