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Thread: Different Cotter Pin

  1. #1
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    Question Different Cotter Pin

    Hello all -

    I was at the range the other day and a man was disassembling his ar15. I noticed that he had a different cotter pin than what I had in my colt. I've looked it up, and its a KNS Perma pin? that is claimed to be the "original".

    Anyone have info on this? The gentleman also claimed that this version of the cotter pin was of a higher quality. I've only ever bent one cotter pin, and took all of two seconds to find a replacement. Why is this supposedly better?

  2. #2
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    Anything made of tool steel is going to be preferable to some piece of shit cotter key. It's basically the original design Eugene Stoner used....

    http://www.gandrtactical.com/cgi-bin...ategory%3DKNSP

  3. #3
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    They're based on the very early original design.

    I've got one installed on a Colt BCG.

    It's a pain in the ass to pull and reinstall compared to the cotter pin.

  4. #4
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    The only thing I don't understand about the Perma Pin from KNS, is the instructions with mine said to install it with the SLOT in the pin, horizontal in relation to the length of the bolt.
    IOW, you don't install the pin with the slot going up and down...

    WHAT's the deal with that? Some sort of strength issue with the grain of the steel I presume???

  5. #5
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    Anyone have a link on info about why the change was made? Can't find anything.

    Paul - I'm taking a wild guess, but maybe the pin won't take a set at the flared end. If it were installed horizontally then the pressure would be distributed and long term it would stay tight?

  6. #6
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    The KNS Perma Pin is much stronger than standard cotter pins. I see bent cotter's all the time so it is a frequent occurence I think.


    C4

  7. #7
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    I run the KNS perma pin in my carbine. It's easier to install and remove for me and I've never had any problems. I used to get bent cotter pins quite often but the KNS fixed that.
    Back in the land of Waffle House and sweet tea!!!

  8. #8
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    I've seen no need for the KNS perma pin. When using a shrouded carrier I never seen a bent FPRP. An old USMC 2112 showed me a trick many moons ago. The trick is when reinstalling the FPRP is to make it 90 degrees different than the firing pin. This allows the firing pin to apply force to both legs of the FPRP. Using this method I've never worn FPRP nor broken a FPRP using a shrouded carrier.
    Chief Armorer for Elite Shooting Sports in Manassas VA
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  9. #9
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    Quote Originally Posted by gotm4 View Post
    I've seen no need for the KNS perma pin. When using a shrouded carrier I never seen a bent FPRP. An old USMC 2112 showed me a trick many moons ago. The trick is when reinstalling the FPRP is to make it 90 degrees different than the firing pin. This allows the firing pin to apply force to both legs of the FPRP. Using this method I've never worn nor broken a FPRP using a shrouded carrier.
    I personally have never had a bent CP, but do see them a lot. I am guessing that there are a lot of low quality CP's out there and also a lot of unshrouded carriers.


    C4

  10. #10
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    Question

    Quote Originally Posted by C4IGrant View Post
    I personally have never had a bent CP, but do see them a lot. I am guessing that there are a lot of low quality CP's out there and also a lot of unshrouded carriers.


    C4
    What is meant by the term "unshrouded carrier"?
    "Most standards are set low to accomodate the bottom feeders of life who lack the personal pride, motivation and determination to rise above the rest." - Paul Howe

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