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Thread: AR build light primer strike problem fixed but what caused it?

  1. #31
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    Springs don't get stretched out, they shrink or compress. The most plausible theory is that they are shitty springs made from who knows what. A few extra coils isn't going to matter, especially if one knows what the min./max. lengths are.


    Quote Originally Posted by Wallace's View Post
    Sounds like a carbine spring got stretched out fatiguing it and reducing its spring rate OR a rifle length (A2 stock/buffer length) got "made" to fit....

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  2. #32
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    Just get a heavier hammer like a m16 hammer. Hk did that with their MR556. And get a heavier bolt carrier to increase reliability.
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  3. #33
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    Please explain how an M16 hammer is going to solve this issue as compared to a an AR15 hammer?

    Quote Originally Posted by ClassIIIGunsmith View Post
    Just get a heavier hammer like a m16 hammer. Hk did that with their MR556. And get a heavier bolt carrier to increase reliability.



    Owner/Instructor at Semper Paratus Arms

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  4. #34
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    Op,

    Just some food for thought on your next build. If you run into issues on your next build, replace one part at a time until you get the appropriate results. I know you *Fixed* the issue on your build, but you never really figured out the problem part. ( I would also agree that it was most likely the action spring)

    If I read correctly, you replaced the receiver extension, action spring, and buffer with new parts. Swapping one by one would have told you the problem part most likely. Just something to consider for the future.
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  5. #35
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    Quote Originally Posted by Iraqgunz View Post
    Springs don't get stretched out, they shrink or compress. The most plausible theory is that they are shitty springs made from who knows what. A few extra coils isn't going to matter, especially if one knows what the min./max. lengths are.
    I understand how springs fatigue. My first though was someone yanking the the buffer spring out and it catching on the hammer casing it to get stretched( not that plausible, BUT who knows as buffer spring would have to be pretty far out if spec to cause that much bolt bounce) . Also, given how many bubba AR's I have seen built (not talking about the OP, just in general) it wouldn't surprise me at all to see someone stretch a carbine spring to "fit" a rifle tube :-/

  6. #36
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    Quote Originally Posted by ClassIIIGunsmith View Post
    Just get a heavier hammer like a m16 hammer. Hk did that with their MR556. And get a heavier bolt carrier to increase reliability.
    Amazing.

  7. #37
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    Quote Originally Posted by ClassIIIGunsmith View Post
    Just get a heavier hammer like a m16 hammer. Hk did that with their MR556. And get a heavier bolt carrier to increase reliability.
    The MR556A1 uses a 2 stage trigger. Not exactly an M16 FCG component....

  8. #38
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    Quote Originally Posted by Iraqgunz View Post
    Please explain how an M16 hammer is going to solve this issue as compared to a an AR15 hammer?
    German Engineering.

    And add some tungsten weights in the bolt carrier to make it heavier(since its already an M16 carrier). You learn this stuff in class3gunsmithing school.
    Last edited by MegademiC; 12-01-14 at 23:35.

  9. #39
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    Quote Originally Posted by Slvr Surfr View Post
    Op,

    Just some food for thought on your next build. If you run into issues on your next build, replace one part at a time until you get the appropriate results. I know you *Fixed* the issue on your build, but you never really figured out the problem part. ( I would also agree that it was most likely the action spring)

    If I read correctly, you replaced the receiver extension, action spring, and buffer with new parts. Swapping one by one would have told you the problem part most likely. Just something to consider for the future.
    Thanks for the advice. I would have done it one part at a time but the spring, castle nut and receiver extension came in an ATI kit. The castle nut and receiver were not mil spec. The castle nut didn't have staking notches and the receiver extension threads wouldn't allow the buttstock to fully collapse. It was the only thing I could find at the time. They were also the only unknown parts that I have used. I figured that the BCM H2 buffer wasn't the issue and the ST2 buffer came as a kit. So I just swapped the whole thing. I have always used the top brand components and the one time that I didn't I got burned. Best way to learn is the hard way.

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