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Thread: Different Cotter Pin

  1. #11
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    Quote Originally Posted by Mojo58 View Post
    What is meant by the term "unshrouded carrier"?
    The carrier on the left is unshrouded, the middle and right carrier are shrouded.

    Chief Armorer for Elite Shooting Sports in Manassas VA
    Chief Armorer for Corp Arms (FFL 07-08/SOT 02)

  2. #12
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    Are shrouded carriers found only in select fire guns? Can one use a shrouded carrier in a semi AR to "protect" all associated parts i.e. the cotter pin etc within the carrier?

  3. #13
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    Quote Originally Posted by GNXII View Post
    Are shrouded carriers found only in select fire guns? Can one use a shrouded carrier in a semi AR to "protect" all associated parts i.e. the cotter pin etc within the carrier?
    Many earlier than 2004 AR15 carriers are unshrouded.
    Chief Armorer for Elite Shooting Sports in Manassas VA
    Chief Armorer for Corp Arms (FFL 07-08/SOT 02)

  4. #14
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    Don't intend to hijack this thread but should I be concerned with the unshrouded carriers being in a majority of my rifles? I have never had any reliability issues with any of them...

  5. #15
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    Quote Originally Posted by GNXII View Post
    Don't intend to hijack this thread but should I be concerned with the unshrouded carriers being in a majority of my rifles? I have never had any reliability issues with any of them...
    Most don't have any issues except for the occasional bent FPRP.

    The unshrouded carrier was a Colt idea (IMO not a brilliant one) for AR15 use only. If yours is running fine you don't have anything to worry about.

    In the event of hammer follow with an AR15 notched hammer an unshrouded carrier is supposed to keep the rifle from slam firing. It does and it causes a bent firing pin as the hammer jams on the end of the firing pin.

    The unshrouded carrier can only use an AR15 firing pin where as the shrouded model can use an AR15 or M16 firing pin.

    Full auto carriers are all shrouded.
    Chief Armorer for Elite Shooting Sports in Manassas VA
    Chief Armorer for Corp Arms (FFL 07-08/SOT 02)

  6. #16
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    Ok so what size is the FPRP if i need to get one local say hardware or TSC in the event of, oops iam out of them and need them now.

  7. #17
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    FPRP

    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 FPRP nor broken a FPRP using a shrouded carrier.
    Thanks for posting that pic GotM4! I checked mine right away. I have another request though: are you able to post a pic of what you mean by making it 90 degrees different than the firing pin? Do you mean that the two legs are vertical in the hole or horizontal in the hole? Much appreciated .

    -Chris
    "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

  8. #18
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    Quote Originally Posted by Steve View Post
    Ok so what size is the FPRP if i need to get one local say hardware or TSC in the event of, oops iam out of them and need them now.
    The hardware store cotter pins will not work for long in an AR15.

    Quote Originally Posted by Mojo58 View Post
    I have another request though: are you able to post a pic of what you mean by making it 90 degrees different than the firing pin? Do you mean that the two legs are vertical in the hole or horizontal in the hole?
    With the carrier laying horizontal the FPRP should be inserted vertically, one leg will be sitting on top of the other. So that the firing pin will make contact with both legs of the FPRP not just one.
    Chief Armorer for Elite Shooting Sports in Manassas VA
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  9. #19
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    Quote Originally Posted by gotm4 View Post
    The hardware store cotter pins will not work for long in an AR15.

    Yes i understand that, its a just in case plan i usually carry spare kits anyhow or a second gun

  10. #20
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    Thanks

    Copy that. Thanks for your patience GotM4
    "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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