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Thread: Why use taper pins (instead of roll pins) on gas blocks?

  1. #21
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    Wow, excellent info in this thread.

    With all the lo-pro gas blocks tucked under rails on ARs these days i wonder if these spirol pins make more sense for us too?

  2. #22
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    Do the HKs use Spirol pins or spring roll pins? Big difference.

  3. #23
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    Quote Originally Posted by Tweak View Post
    Do the HKs use Spirol pins or spring roll pins? Big difference.
    Spirol pins are coiled spring roll pins.

    Slotted spring roll pins are the kind to avoid.

    HK uses the Spirol style.

  4. #24
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    Using taper pins I have had the sight tower get canted from receiving a hit to the gas block. I doubt using a less firm mounting solution is a good idea.....

  5. #25
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    Quote Originally Posted by rsilvers View Post
    HK uses the Spirol style.
    Thank you.

  6. #26
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    Taper pins are strong, but are also easy to assemble... they do not gall and bend, time is money. The correct size for a FSB pin is a 2/0 pin. A 2/0 pin has a head diameter of 0.141, the taper is 1/4 inch for every foot and the small end size is determined by the length of the pin.

    To really impress the chics, the size of the small end is the diameter of the large end, minus (the length of the pin X 0.02083)
    Please let me know if I have offended you...
    I would like to move on to my next task.


    I provide legal consultation and training - specializing in the Law of Gravity.

  7. #27
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    Quote Originally Posted by K.L. Davis View Post

    To really impress the chics, the size of the small end is the diameter of the large end, minus (the length of the pin X 0.02083)
    Those must be some real party girls...
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  8. #28
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    Quote Originally Posted by K.L. Davis View Post
    ....To really impress the chics, the size of the small end is the diameter of the large end, minus (the length of the pin X 0.02083)
    It is actually 0.02083487643024583302.....

  9. #29
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    I have been experimenting with using coil spring pins for a couple of years, allows notching the barrel in the same op as fluting and drilling the gas port. I might lean toward solid pins if I was mounting a bayo, but for a concealed low pro there are advantages, including no risk of bore deformation by driving a wedge perpendicular to it.

  10. #30
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    so, it sounds like we need a straight, solid pin with a keeper on it.

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