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The Sten MKII submachine gun build

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  • The Sten MKII submachine gun build

    It has begun!

    First, a refresher. The parts I ordered...

    A WWII British Sten MKII submachine gun de-milled to ATF standards. Receiver is torch cut. This means it is just parts, and can legally be shipped to my house.



    A 16" 9mm barrel. I ordered my parts kit without the original 9" barrel as that would be illegal to use without a tax stamp for an SBR build.

    A new 80% (or less) receiver, which is an ATF approved design because it has a smaller inside diameter and CANNOT accept a full auto bolt.

    A new semi-auto bolt, which uses an AR-15 firing pin. It includes a new spring kit and associated parts.

    All parts are able to be shipped to my house.



    I am going to be using my neighbors Bridgeport. I have been waiting patiently for him to acquire more endmills for it, but while I wait for the rest to arrive, I decided to get the rest of the de-milling of the old receiver done today. This involves cutting and breaking weld spots on what's left of the old receiver so that the rest of the parts can be removed and used on the new receiver.

    This is the rear portion of the old receiver, and there were four weld spots. I only saw three of them, one at the top on the right near the rear peep sight, and two in the middle at the tabs above the trigger housing. The fourth weld was a very small one on the bottom side right (the other side of the receiver from the first weld spot mentioned above), which was covered by the trigger assembly. After the first three welds were done, the old receiver would not slide out of the receiver housing, and it took some judicious pounding to get it out, at which point the fourth weld spot was discovered, as it broke free from the pounding.



    This is the front portion of the receiver. Cutting off the slag on the right side allowed the magazine housing to slide off.



    Magazine housing removed. Also, front sight post removed



    Another part to remove from the front part is the barrel bushing, where there were four weld spots around the front edge of the receiver. Once the weld spots were mostly cut through, some chisel work peeled away the rest of the receiver from the front bushing. I can see why people just order a new barrel bushing for $28, because this is the hardest part to de-mill and it got a little messed up.



    Finally, there is this piece on the inside of the old receiver. I haven't removed it yet, and I don't even know what it's for. I'll deal with that later. EDIT: It is the ejector.



    I'll update this thread with the next step once it's completed.
    Last edited by Pissed Off Patriot; 08-06-2017, 09:14 PM.
    "I ask, Sir, what is dinner? It is the whole chicken. To pluck the chicken is the best and most effectual way to prepare them."
    Colonel Sanders

    That is a NICE looking bunch of meat!

    I can still find a use for my thumb, even though it no longer has a hole to finger.

    Still cracking my nuts!

  • #2
    What an awesome idea POP. Sounds like you got some skills.
    Hi! My name's Terrie, and I used to be a smoker.

    I like it small...

    Comment


    • #3
      Great project! Looking forward to updates.
      I bought my sons out of state.

      Comment


      • #4
        Very cool good luck and thanks for sharing.
        Gun and magazine bans - the government has no business dictating what types of firearms good, honest people are allowed to own. President-Elect Donald J Trump

        Comment


        • #5
          Thanks, guys. I really wasn't sure about this project at first, but once I started, I realized I was just psyching myself out. It really doesn't seem to be that technically challenging.

          I should add that it took about an hour to de-mill the old receiver. Tools used so far are a bench vise, a Dremel and hand held grinder, and a hammer and chisel.
          "I ask, Sir, what is dinner? It is the whole chicken. To pluck the chicken is the best and most effectual way to prepare them."
          Colonel Sanders

          That is a NICE looking bunch of meat!

          I can still find a use for my thumb, even though it no longer has a hole to finger.

          Still cracking my nuts!

          Comment


          • #6
            Originally posted by Pissed Off Patriot View Post
            It really doesn't seem to be that technically challenging.
            My understanding is that was kind of the whole point of the Sten design.

            Do you have any plans a final finish yet?

            NRA Life Member
            NRA Basic Rifle Instructor
            www.unconvictedfelon.com
            www.facebook.com/blackcoyotesrt

            I was thinking of his cannon.

            Comment


            • #7
              Originally posted by WARFAB View Post

              My understanding is that was kind of the whole point of the Sten design.

              Do you have any plans a final finish yet?
              Yes, which is why I chose it for my first build.

              Original finish on these was black paint which I thought I'd duplicate, but I now I'm thinking ceracote for a more durable finish
              "I ask, Sir, what is dinner? It is the whole chicken. To pluck the chicken is the best and most effectual way to prepare them."
              Colonel Sanders

              That is a NICE looking bunch of meat!

              I can still find a use for my thumb, even though it no longer has a hole to finger.

              Still cracking my nuts!

              Comment


              • #8
                I'm following this!!!!!! I was just looking into this myself. It's really hard not wanting to get it a open bolt for some added fun especially with how cheap 9mm is lmao

                Comment


                • #9
                  This is making me wanna dig out my m1919 project back out to get it finished up

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                  • #10
                    I don't mean to blow up this thread, what about the mags for this? Won't Mussolini cuomo stomp his feet and charge with a felony if you have a original stick mag? That's the thing that's nice with the m1919 I have I have a box of a 1000 links for a reason 😁
                    Last edited by blackpowdershooter30; 09-11-2017, 12:25 AM.

                    Comment


                    • #11
                      Originally posted by blackpowdershooter30 View Post
                      I don't mean to blow up this thread, what about the mags for this? Won't Mussolini cuomo stomp his feet and charge with a felony if you have a original stick mag? That's the thing that's nice with the m1919 I have I have a box of a 1000 links for a reason 😁
                      I have a source out of state that can get me the mags.

                      Then all they need is to be blocked to 10 rounds.

                      http://www.magazineblocks.com/magent...d-limiter.html
                      "I ask, Sir, what is dinner? It is the whole chicken. To pluck the chicken is the best and most effectual way to prepare them."
                      Colonel Sanders

                      That is a NICE looking bunch of meat!

                      I can still find a use for my thumb, even though it no longer has a hole to finger.

                      Still cracking my nuts!

                      Comment


                      • #12
                        Originally posted by blackpowdershooter30 View Post
                        I'm following this!!!!!! I was just looking into this myself. It's really hard not wanting to get it a open bolt for some added fun especially with how cheap 9mm is lmao
                        As for open bolt, that would be a big ATF no-no, as well as well as Herr Cuomo foot stomping. lol
                        "I ask, Sir, what is dinner? It is the whole chicken. To pluck the chicken is the best and most effectual way to prepare them."
                        Colonel Sanders

                        That is a NICE looking bunch of meat!

                        I can still find a use for my thumb, even though it no longer has a hole to finger.

                        Still cracking my nuts!

                        Comment


                        • #13
                          Subscribed- what a great project.
                          Ok I can go a couple ways

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