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Thread: Interesting failure

  1. #11
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    Quote Originally Posted by ra2bach View Post
    this goes against common knowledge. generally, if a bolt doesn't lock back, you go to a lighter buffer. maybe you had this problem before you changed buffers...
    A buffer that's too light on an overgassed gun will cause the bolt to outrun the mag follower, and thus no lock back.
    "You people have too much time on your hands." - scottryan

  2. #12
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    Quote Originally Posted by markm View Post
    A buffer that's too light on an overgassed gun will cause the bolt to outrun the mag follower, and thus no lock back.
    I understand. but how often is that the norm? generally with way too big gasports or with suppressor, no???

    magic 8-ball says probably had broken hammer pin before buffer change...
    Last edited by ra2bach; 03-27-13 at 12:25.
    never push a wrench...

  3. #13
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    https://www.m4carbine.net/showthread.php?t=124949

    That's my thread... but it was not the hammer pin - it was the trigger pin.





    Did it look like that ^^^^^ ?
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  4. #14
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    ^^^^^^^^^^^^^
    Exactly like that...same look to the break and all.

    Too light of a buffer can prevent lock back of the bolt. I know it may seem counter intuitive to you, but if you read the buffer threads and posts on like malfuntions, a heavier buffer solves the issue nicely.

    And I believe your magic 8 ball is wrong, RA2Bach. Prior to looking for a change of buffer, a complete detail and cleaning inspection was made to preclude any other issues before screwing with things. With that said, I bet you're right it was a significant causal factor though.
    Last edited by Chorizo; 03-27-13 at 14:33.
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  5. #15
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    The consensus on my thread was that it was a crappy pin.

    Luckily it was very good CS on part of who I purchased the lower from and I had a new pin (multiple) in a few days.
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  6. #16
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    Quote Originally Posted by ZoneOne View Post
    https://www.m4carbine.net/showthread.php?t=124949That's my thread... but it was not the hammer pin - it was the trigger pin.
    http://img19.imageshack.us/img19/9457/brokenpin4.jpg
    http://img5.imageshack.us/img5/33/brokenpin3.jpg
    Did it look like that ^^^^^ ?
    Who knows? A smaller pic that wasn't fuzzy might help.

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  7. #17
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    The shop where I used to work had a Colt 635 on the rental wall and that joker used to break quite a few hammer pins. Is that a known issue with 9mm AR's due to the blow-back vs gas operation?
    Semper Paratus Certified AR15 Armorer

  8. #18
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    Quote Originally Posted by Chorizo View Post
    ^^^^^^^^^^^^^
    Exactly like that...same look to the break and all.

    Too light of a buffer can prevent lock back of the bolt. I know it may seem counter intuitive to you, but if you read the buffer threads and posts on like malfuntions, a heavier buffer solves the issue nicely.

    And I believe your magic 8 ball is wrong, RA2Bach. Prior to looking for a change of buffer, a complete detail and cleaning inspection was made to preclude any other issues before screwing with things. With that said, I bet you're right it was a significant causal factor though.
    damn magic 8-balls, they don't make'em like they used to ...

    but anyway, I stand by my original statement - MOST times a bolt not locking back is caused by being undergassed, low power ammo, or too heavy a buffer...
    never push a wrench...

  9. #19
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    Yes, that is very common with the 9mm uppers. That is why Colt came out with the stainless pins.

    I've gone through quite a few on my select fire lower until I installed the KNS pins. Haven't broke one since.

    Quote Originally Posted by ASH556 View Post
    The shop where I used to work had a Colt 635 on the rental wall and that joker used to break quite a few hammer pins. Is that a known issue with 9mm AR's due to the blow-back vs gas operation?

  10. #20
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    Interesting failure

    Quote Originally Posted by wetidlerjr View Post
    Who knows? A smaller pic that wasn't fuzzy might help.
    Figuring the OP could see it fine and the pictures are in an acceptable resolution. I'm going to assume that it's your computer / phone. You're more then welcome to click on the link I provided and look at the pictures there.
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