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Thread: Pivot pin question

  1. #1
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    Pivot pin question

    So I bought this 1981 SP1 carbine end last year. Gorgeous, nimble, light and simple, and quite rare around here (Switzerland).



    But it had this weird looking pivot pin





    Instead of the normal two screws pin



    At first I thought I needed to find an original pin. But then I started liking this device : the fit is perfect, it’s tight, and allows an instant disassembly of the upper and lower as was originally intended.

    So now instead of replacing this by the original two screw, I am thinking of converting my other large pin Colt’s with this .... if I can find it.

    It looks very similar to the pins used on HK weapons





    But from my research the HK ones are smaller, both in length and diameter.

    So I am looking for clues which weapon is using this, and if I can find a few.

    Here are pictures and the dimensions in two standards


















  2. #2
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    Same idea, but a slightly different execution.

    https://www.knsprecisioninc.com/prod...t-pin-315-dia/

    Never measured one, but the .315" vs. .314" may be a point to look at.

  3. #3
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    Thanks a lot, I’ll probably buy a few of those if I can’t find the one I’m looking for

  4. #4
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    On the chance that wasn't originally an SP1 replacement, you might check hardware suppliers in your area for something along the lines of a self locking clevis pin. We have something similar to that pin here, but with a slightly different spring retainer.

  5. #5
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    Remember the original SP1 had a two screw pivot pin and it was a little larger than mil spec so that SP1 uppers and lowers did not fit with military uppers and lowers. This is probably after market. If it works don't worry about it, just enjoy it. I have an after market quick disconnect pin on my SP1 different from this, but it works fine. I still have the original double screw pin, but I never use it.

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  7. #7
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    Quote Originally Posted by MQ105 View Post
    Thanks but discontinued by manufacturer

  8. #8
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    Quote Originally Posted by OLIAR15 View Post
    Thanks but discontinued by manufacturer
    I'm pretty sure I have one in my parts bin if you really want it

    But I do like the one you have more!

    Dennis.

  9. #9
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    Quote Originally Posted by Dennis View Post
    I'm pretty sure I have one in my parts bin if you really want it

    But I do like the one you have more!

    Dennis.
    Thanks, I’ll be happy to buy it from you.

    I like the one I have too, but I have only one pin and 5 rifles. And I still have not identified its origin.

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