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AGM MP40 fully overhauled - picture journal

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  • AGM MP40 fully overhauled - picture journal

    Hey chaps, while the Lewis gun mag is off for fiber glassing I thought I'd make a start on my MP40.

    Now the MP40 caused me grief before I got it. I spent months tracking down a shop with them in stock only to be let down after I paid for it (thanks Boomarms) Then a chap at my local site offered me this beauty with 5 mags and a repro sling for £150.



    After much shooting from the hip and posing I cracked out the tools... A short skirmish showed up a lot of design flaws with the AGM system and I was determined to sort all of them and some once and for all!

    The work list is as follows
    • Strip and clean
      New piston and head
      New cylinder and Head
      Metal bushings
      Bearing spring guide
      New gears (might as well)
      Re shim and lube
      AK hop and TM mp5 barrel
      TM rubber
      H nub
      MOSFET trigger system and re wire
      Strip the paint and re finish with Birchwood Casey products
      Modify bolt with possible RS style safety
      Possibly stamp trades


    Mechanical



    The nozzle is a AK style one that doesn't fit! AGM nozzle is longer by a few mm. Cylinder is just out of shot.

    With all my parts here it was time to strip the beast. Oh what a gungy filled mess it was!



    How much goo can you fit in!



    Now I only want full auto so I looked at the trigger system and didn't like it so i binned it in favor of a micro switch/mosfet system.That allowed me to strip out loads of unnecessary parts. Everything below is redundant, No more trigger bar for me!



    And this is what I kept, found out later i had to re use the stock nozzle.



    Sadly I forgot to take a photo of the internals after fitting (doh) and really didn't want to re open it for no reason. Trust me when I say it's pretty

    Electrical

    First thing's first I got rid of the stock wiring loom including this abomination (what a pants system)



    Couple of reference shots for tho's who don't know what the stock set up is



    trigger bar



    More in post two.....

  • #2
    Re: AGM MP40 fully overhauled - picture journal

    Needed a way to fit a switch for the Mosfet. So I used an old V3 GB clip and chopped it...



    and got a tiny surface mount switch..



    And foam backed it to protect against trigger over travel and heavy trigger pulls



    Then I put it all together and got this



    It took a little packing and adjusting to get it sitting properly, but now it sits nicely and works very well. Now a little switch like that would melt if I used it as the trigger on its own. So I rustled up a non breaking Mosfet (IRL1404z) and wired it in with lovely 12awg silver flex and a gold plated deans connector. Bling bling



    Short wires means lower resistance, soldering all connections helps too! I'm aiming for maximum efficiency.



    My 7.4 lipo fits just perfectly in the battery space and gives a nice low is ROF (~850rpm) I want eventually to get closer to 600 as this project is all about paying homage to the RS MP40



    Just an overview pic so you can see the layout. Mosfet sits in the top part of the pistol grip.



    That's all for tonight. I'll be doing the hop and externals tomorrow so expect lots of photo's!

    Suggestions and comments welcome, If you've got any pics of the AK hop mod that would be a big help

    Ta

    Dave

    EDIT: Photobucket is having a bad day and the last few pics are inverted sorry for that

    Comment


    • #3
      Re: AGM MP40 fully overhauled - picture journal

      Update

      First up a quick look at the revised internals, Opened it up again to change it over to a silent piston head.



      Internals, so much more room now!



      Then came the real work! Stripping finest Chinese paint to get down to the bare metal. SO much hassle

      NITROMORES FTW! Was doing a mates AKMS at the same time



      Results



      The steel wouldn't give up its paint so I had to wire wheel it.



      Wanted a full bolt so cracked out the Dremel and got grinding (took two cutting wheels and 3 stones)

      Results



      Then I cracked out the cold blue Before (left) and after (right)



      Didn't want a perfect blue as I wanted an antique/work horse look. so i applied it quite slap dash

      Then did the Ali parts with aluminum black



      Then it was just a case of oil and assemble





      More in a mo

      Comment


      • #4
        Re: AGM MP40 fully overhauled - picture journal

        And here she is as she stands. Still need to do the hop and barrel and fill selector hole. Maybe add trades too









        Comments welcome

        That's all for today I'm shattered!

        Ta

        Dave

        Comment


        • #5
          Re: AGM MP40 fully overhauled - picture journal

          Thats lookin sweet! Makes me want to buy one xD

          Comment


          • #6
            Re: AGM MP40 fully overhauled - picture journal

            great work mate well done... very well done
            sigpic

            Comment


            • #7
              Re: AGM MP40 fully overhauled - picture journal

              Very nice, well done man!

              Comment


              • #8
                Re: AGM MP40 fully overhauled - picture journal

                Looks wonderful. One thing I'd suggest with the trigger though. If you get a 2 way microswitch, and have it wired so the switch is tripped when you move the trigger away from it, instead of towards it, you'll significantly reduce any chance of damage to the trigger switch by accidentally pulling it too hard. Or giving it to someone else for a shot or 2, and they pull it too hard. It's a small detail, and the switch you have is well set up anyway, but you might want to think about it if you have the room.

                Then again, your current set up looks like it'll provide a fairly positive 2 stage trigger pull. So you may have actually come up with a better solution.
                sigpic
                Tanaka M700 RealSword SVD TM VSR
                I want your broken Tanaka shotguns!

                Comment


                • #9
                  Re: AGM MP40 fully overhauled - picture journal

                  great job....well done,i feel inspired now

                  goes to the fridge to get a beer...because i know i dont have the time or effort to do something similar now or in the near future,so i will drown my sorrows instead
                  VICTORIA CONCORDIA CRESCIT


                  LOOKING FOR: S&W N-frame holster
                  trader feedback http://forums.zeroin.co.uk/itrader.php?u=5191

                  Comment


                  • #10
                    Re: AGM MP40 fully overhauled - picture journal

                    I've got a AGM sten so I assume you use version 3 parts? err like cylinder head, spring guide etc. Could you tell me what type cylinder used and are they all standard? regarding type 0, type 1 etc
                    Last edited by MistroJoe; 27 November, 2010, 23:35. Reason: Forgot to put in part type
                    "I guess it comes down to a simple choice. Get busy living or get busy dying."
                    Red - Shawshank Redemption

                    Comment


                    • #11
                      Re: AGM MP40 fully overhauled - picture journal

                      Originally posted by MistroJoe View Post
                      I've got a AGM sten so I assume you use version 3 parts? err like cylinder head, spring guide etc. Could you tell me what type cylinder used and are they all standard? regarding type 0, type 1 etc
                      OT - the Sten uses an M14 gearbox, not an MP40 box.

                      Comment


                      • #12
                        Re: AGM MP40 fully overhauled - picture journal

                        Thanks Gents @ dope on a rope the micro switch is backed with closed cell roam so is protected from over pressure.

                        Have an update


                        THE HOP UP MOD - I know it's a big thing with this gun.

                        Firstly for this you'll need the following (Assuming you've removed the unit from the gun)...
                        • fine tooth hand saw
                          Small round file or sandpaper wrapped around a dowel
                          Hammer
                          PTFE Tape
                          MP5 length barrel
                          Hop rubber
                          H nub (optional)
                          Cuppa tea


                        Firstly remove the hop slider, hop arm and barrel spacer and put in a safe place.

                        Then make a radial cut here



                        this part of the hop unit should come loose now (i've left the collar on here. It's better to remove it first)



                        Now you need to GENTLY persuade the hop unit off the the end of the barrel :whistle:



                        After tapping off the hop you'll be greeted with this. You'll need to find the c clip that's been glued in and remove it with a small bladed screwdriver.



                        Here it is with the c clip and rubber removed



                        Right. now you need to cut down this bit of plastic on the end off the barrel. You're gonna use this as a spacer for the new barrel. see below



                        Now on my tm barrel it was a tight bugger and needed filing. This build relies on friction to hold it together so be careful taking out too much material. (you can always use glue if you mess up) Make sure the groove in the underside of the barrel lines up with the grove in your spacer (you'll see it)

                        Now pop your choice of hop rubber on. I like to give it a damn good wrap in PTFE for a bit more air seal



                        Now you need to carefully re assemble the unit by sliding the barrel with collar into you unit (oo er missus) check that the lip of the hop rubber doesn't protrude to far into the feed part of the chamber. best way to do this is shine a light in the nozzle opening and look down the feed tube.

                        Put the front of the hop unit back on and the barrel collar too. Re assemble the hop arm too. I found that the cut out for the nub was poorly made so I filed off the flash before fitting a H nub.





                        Like I said this mod uses friction to hold it together. You can use glue but I like to have the option to strip and re build. I will do a full AK hop conversion next. If only to make another guide! Sorry the photo's are a little sparse but I was doing this at 11pm the night before a game!

                        Post game results were good. I got lots of long range hits and grouping was tight. I did however get some hop creep but i put that down to sub zero conditions and grease migrating from the freshly built cylinder into the hop unit.

                        Any Qns just ask

                        and watch this space for the TM ak hop mod

                        Thanks

                        Dave

                        Comment


                        • #13
                          Re: AGM MP40 fully overhauled - picture journal

                          Hey Dave,

                          I hope all is well.

                          I came across your fascinating thread on the ZeroIn forums on how to mod the AGM MP40. Brilliant! As it goes, I am writing an article on the MP40 and airsoft variants for Airsoft magazine and this is all very good information for my research. I have had the annoying single fire selector removed as well as the power select switch on the bottom of the handle as this caused some problems in the past. That said, and as I am very pathetic as a craftsman, would you be able to give my MP40 some modifications and smoothing over the selector switch in return of some £££?

                          Also, I'd be delighted to refer to you in the article. Nice!

                          With very best wishes,

                          Jay

                          Comment


                          • #14
                            Re: AGM MP40 fully overhauled - picture journal

                            Sorry if this is necro-posting but I've only just found this thread. Did you use the degreaser before using the blue cos I've tried a sample without and it didn't take too well (although the Ali black was fine). Cheers!

                            Comment


                            • #15
                              Re: AGM MP40 fully overhauled - picture journal

                              As a ww2 re-enactor who has just got one of these, all I can say is superb work, with the brown it looks like the Bakelite mp38 too, but the new finish is very very good, would like to ask how much you'd charge for the external work over? it really is that good that I'd almost dodge the moths amongst the white fivers
                              sigpic.
                              Never underestimate the power of human stupidity......................................... ..
                              Especially mine.

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                              kalashnikov_kid Gunsmith and team leader of the Infidels Find out more about kalashnikov_kid
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