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Thread: Modern Cotter Pin Firing Pin Retainer vs. Traditional Solid Pin

  1. #11
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    Quote Originally Posted by tom12.7 View Post
    OP, I'm curious about the source of your SS FP retainer. You can PM if you prefer.
    Sure thing, and no need to PM. It's from ar15sport.com. I know the owner, and a lot of the stuff he sources is from defense contractors. He has helped me get ahold of some really hard-to-find AR parts in the past, and always supplies good stuff. I don't get anything for plugging his stuff here, I've just been pleased with the parts I've gotten from him.

  2. #12
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    HK rifles use solid, captive pins.

  3. #13
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    I have used both. I find the cotter pin easier to remove during disassembly.
    The number of folks on my Full Of Shit list grows everyday

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  4. #14
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    Quote Originally Posted by lysander View Post
    There is no loading of this pin
    That is not correct.

  5. #15
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    Quote Originally Posted by EzGoingKev View Post
    That is not correct.
    How is it loaded?

  6. #16
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    Quote Originally Posted by lysander View Post
    How is it loaded?
    Every time the bolt carrier reaches its rearmost travel and changes direction the firing pin slams into the retaining pin.

  7. #17
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    Quote Originally Posted by militarymoron View Post
    Every time the bolt carrier reaches its rearmost travel and changes direction the firing pin slams into the retaining pin.
    Which is the slightly less than the loading at the end of the recoil stroke (the buffer bumper takes a lot of the sudden stop out). The energy in the firing pin at the end of the recoil stroke puts a tiny dent in the brass primer.

    If you take the bolt carrier group out of the rifle and shake it like a spray paint can, you have loaded the retaining pin about the same amount. That is not what is considered "loaded" in the engineering sense.
    Last edited by lysander; 12-09-17 at 20:03.

  8. #18
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    Quote Originally Posted by lysander View Post
    That is not what is considered "loaded" in the engineering sense.
    In the engineering sense, it's considered a 'live load' since it's moving; not a 'dead load'. It's still a repeated impact, however small.

  9. #19
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    Quote Originally Posted by militarymoron View Post
    In the engineering sense, it's considered a 'live load' since it's moving; not a 'dead load'. It's still a repeated impact, however small.
    I will caveat the **** out of this as this might be over my head, and I've had more than a few drinks, but, if the cotter pin is steel, and a solid pin is steel, if both are getting a load that are below there respective break points, does it even it matter what type you use? If it does not, does it not make sense to then use whatever is cheaper?
    "I don't collect guns anymore, I stockpile weapons for ****ing war." Chuck P.

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  10. #20
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    Quote Originally Posted by Kain View Post
    does it even it matter what type you use? If it does not, does it not make sense to then use whatever is cheaper?
    Wouldn't matter to me; I agree. I'm not advocating using a solid pin; I was just pointing out that the pin does see a load, however small, during the firing cycle.

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