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Thread: firing pin designs... why the change?

  1. #1
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    firing pin designs... why the change?

    Gents,

    I have been curious about this for a while, perhaps someone can enlighten me as to why the original Stoner designed firing was redesigned... Specifically, the end of the pin that is hit by the hammer changed from a cone shape to a rounded knob shape. Finally, why did H&K decide to utilize the earlier cone shaped design?

    Examples:

    http://black-market-parts.3dcartstor...-44_p_293.html

    vs.

    http://www.brownells.com/.aspx/sid=1...000005_d_10859

    I have been thinking about ordering a few of the earlier style pins to compare and test in my SBR - what say ye?
    Last edited by E-man930; 02-08-12 at 22:37.

  2. #2
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    The extra height is required to function with the 416's firing pin safety mechanism. There is no reason to include one in a regular AR carrier and plenty of reason not to. A standard, chromed pin from BCM will get you by just fine. Forever. And dont try any other stupid crap like taking down the extractor pin with the firing pin tip when you get a normal one.

  3. #3
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    I don't know the actual idea, but if I had to wager a guess, it had something to do with pricing. Any shape, other than a straight line, will require more machineing time. The older pin design looks a lot like the new one (material wise) but after making the pin, they then milled the cone on the head. The new version looks like they just omitted the cone operation, but left the material there (thicker). I would bet this was part of a package of upgrades done in order to either reduce cost or manufacture time.

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    Quote Originally Posted by Pax View Post
    There is no reason to include one in a regular AR carrier and plenty of reason not to.
    For the sake of completeness, what are the reasons not to?

  5. #5
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    It aint broke. Dont fix it.

    This isnt an issue of "oh well, I know it aint broke but perhaps we could extend its functional life by another couple hundred rounds." Standard firing pins usually outlast their operators, IF they dont they cost a few bucks to replace and they function just perfectly. There is no reason at all to go messing around with it. And this is beyond messing around with it. Not only do I see no benefit to a 416 pin in a carrier without a firing pin block, but it could potentially malfunction or damage itself or other vital weapon components. Just. No.

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    Oh, so you don't have any specific reasons, you just see no benefit and fear it might cause a problem?

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    Quote Originally Posted by CumbiaDude View Post
    Oh, so you don't have any specific reasons, you just see no benefit and fear it might cause a problem?
    Sounds like a plenty good reason to me.

  8. #8
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    No.

    Just no.

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    Quote Originally Posted by Pax View Post
    The extra height is required to function with the 416's firing pin safety mechanism. There is no reason to include one in a regular AR carrier and plenty of reason not to. A standard, chromed pin from BCM will get you by just fine. Forever. And dont try any other stupid crap like taking down the extractor pin with the firing pin tip when you get a normal one.
    Care to elaborate on this? I wasn't aware firing pins were chromed...

  10. #10
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    Please do correct me if I am wrong. It is my understanding that standard AR firing pins, regardless of the exact design and dimensions of the collar/rim, receive a chrome plating. I cannot locate an online copy of a Mil STD to cite. Please let me know if you do.

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