The latest MG42 test run...
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Thread: The latest MG42 test run...

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    Happy Camper hcpookie's Avatar
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    Default The latest MG42 test run...

    I had the most successful run ever with my new, thinner firing pin! The main hangup (pun intended) was that the tip was thick enough to cause occassional binding in the locking wedge, since the rear hole in the locking wedge hole is offset lower than the firing pin. I really think a brand-new locking wedge with a centered hole would do wonders for these guns.

    I confirmed I need a new main spring, but other than that, she is working much, MUCH, better than the last run!
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    Chief Administrator 7.62x39's Avatar
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    So where's the pics?
    I've got a buddy who recently picked up a MG42 kit, He's bringing it by this weekend. I'm looking forward to checking it out.
    .

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    Always sore, always tired Bradrock's Avatar
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    Very nice! Will there be an upcoming GUNCO MG42/MG53 build tutorial?? Or do I need to register on yet another forum?? ( Please)
    " Save a tree...........Eat A Beaver!"

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    Gunco Regular acmech's Avatar
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    What was the previous problem? Light firing pin strikes? Are you using an AR fcg modified gripstick or an FAL?

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    Indian Admin Winn R's Avatar
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    Well done. My congrats!

    I still haven't gotten one to run. I get to a spot, then get frustrated.
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  7. #6
    Happy Camper hcpookie's Avatar
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    Quote Originally Posted by Winn R
    Well done. My congrats!

    I still haven't gotten one to run. I get to a spot, then get frustrated.
    I know EXACTLY what you mean!!! I started this last Winter so it has taken me just over a year to get it running!

    This is certainly a labor of love - I'm looking at my PKM receiver shell (from Pirate) and I think that is going to be relatively easy compared to another MG42 build. I have a 2nd '42 receiver that I haven't even started on yet (YIKES!!!). I also have a Yugo front-end and I am considering buying a Coldsteel 80% section to weld to it. That would give me 3 guns after it is all said and done... but at the rate I'm going, it would be like 2010 before I'm done!

    Keep at yours, Winn! I must say I wouldn't be as far along as I am if it were not for the AC inverter I used to power my dremel at the range. It really helps speed things up when you can polish this or that "right there" and test it again. Deductively eliminating the known issues lets you find that hidden problem that you didn't know about...

    Once you isolate specific problems and resolve them, it does get easier every time. Like this last time - there was a clearance problem with the firing pin and roller wedge that I had not identified. I made a new firing pin that was thinner and presto, today that problem is solved.

    Now, at this point, it *APPEARS* that I have only to finally replace my main spring to fix my ejection problems, then I'm ready to paint. Unless, of course, there are actually several problems keeping me from consistently ejecting.
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  8. #7
    Gunco Veteran panaceabeachbum's Avatar
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    the hole thru the wedge does appear to be off center when looking at it from the rear due to the flat for the ejector spoon to pass but if you look at it from the front, where the original pocket was, it should be on the same plane as the two flats and in the center. I drill the roller keys .165 when I do a semi bolt and the firing pin is .15 where it passes thru the key.




    On your ejection , did you drill a hole in the face of the buffer retainer bolt? The firing pin should be sticking out of the back of the bolt aprox .4" . When the bolt recoils the firing pin will hit the bolt in the buffer and the transfer tube at the rear of the bolt wont be able to come in contact with the buffer an initiate ejection. When its hitting properly the cases should eject really hard, I have had them stick in the shooting bench neck down all the way to the shoulder and others bounce off the bench and fly 20 feet in the air.

    I would think the only problem your mainspring would cause with ejection is if you didnt cut 6-8 coils out to compensate for the length of the bolt extension so the bolt can travel all the way to the rear. I usualy cut 3-4 coils to start with and then cut in 1/2 coil increments until the bolt will come all the way back and then 1/2 a coil more.

    look thru the circular hole in the buffer in this pic and you can see that the firing pin is less than .08 from the bolt and the buffer hasnt begun to compress yet.




    that huge spring looks hard to compress but its really not, I can compress it with less than 100 lbs

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    Happy Camper hcpookie's Avatar
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    PBB, I need to look again at my buffer. The *original* problem I began troubleshooting was due to the fact that my carrier extension was too small an ID and caused the carrier to hang on the buffer, not fully bottoming out and not ejecting.

    THEN I found the buffer bolt was loose, and the retainer pin was missing, so it was walking out every visit to the range.

    THEN I found a burr on the ID that was hanging (again!) on the buffer.

    Also, my main spring is bent real bad, and I've read on the MG42 site that a bent spring can cause issues, so for $11 from RobertRTG I figure what the heck...

    PBB it is interesting that you mention "less than 100 pounds" to compress it. I would have put it at less than 20 pounds. Mine seems REALLY light for such a big spring. I suspect it may be weak on this post-WW2 kit. This begs a question - what is the "proper" compression weight range for a properly functioning kit build? I don't think I've ever heard anyone say! Everyone talks about x number of coils this, and Y length that, but I don't think I've ever seen a weight published! HRMMMMMMMM..............

    I have not put a hole in the middle - that's a good idea! Mine is the old style buffer that, apparently, isn't rounded on the end like the M53 and newer buffers. So there's another item to work on.

    I'm *really* close on this! I may have to do some refitting of the sear spring (I'm using a G3 FCG) but by and large I think after I polish things up it will work fine. Everything else seems to work perfectly. It hits a little high at 100 yards and I'm not sure how to adjust elevation on the sights. But that's for later.
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    Project Pink - the Pink and Blue AK-74:
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  10. #9
    Gunco Veteran panaceabeachbum's Avatar
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    I think the G# is a FCG is a great idea, very simple yet hits hard as hell.
    Youre right only about 20 lbs on the mainspring, The 100+ lb one I was refering to is the one in the buffer in my middle pic, with the huge sqaure spring stock to the left of the hole in the nose of the buffer.

    Is your buffer retainer bolt drilled to clear the firing pin?

  11. #10
    Happy Camper hcpookie's Avatar
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    Quote Originally Posted by panaceabeachbum
    I think the G# is a FCG is a great idea, very simple yet hits hard as hell.
    Youre right only about 20 lbs on the mainspring, The 100+ lb one I was refering to is the one in the buffer in my middle pic, with the huge sqaure spring stock to the left of the hole in the nose of the buffer.

    Is your buffer retainer bolt drilled to clear the firing pin?
    I just took it apart to verify - no it is not. It appears that the post-war buffer I have is "longer" than the bolt, because it is recessed quite a ways down. I'm almost certain it isn't hitting the pin. In your pics, it looks longer or perhaps the bolt head on yours is bigger...
    Gunco Member #10

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    The "original" Boltcutter Rivet Squeezers:
    http://pookieweb.net/AK/rivet/boltcutters/boltcutter.htm


    Project Pink - the Pink and Blue AK-74:
    http://pookieweb.net/pink/pink.htm

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