1. #1
    tgace's Avatar
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    Castle Nut Staking

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    One of the little details to look for in an M4/AR rifle is the "staking" of the castle nut on builds using receiver extension tubes. Staking prevents the nut from backing off under hard use. If that happens you may find your stock turning when you don't want it to.

    Staking is fairly simple. Once the castle nut is tightened to the appropriate torque, take a punch and tap some of the metal from the receiver end plate into one of the notches on the nut. If you need to remove the nut in the future you will have to punch the little tab of metal out of the slot and use one of the other staking slots on the nut when you put it back on.
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  2. #2
    BackFistMonkey's Avatar
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    Not a gun guy ... but I can think of tons of other applications where impacts and vibrations wiggle nuts .... I don't know how I have missed such a simple trick
    I don't mean to sound bitter, cold, or cruel, but I am, so that's how it comes out.
    BILL HICKS,
    1961-1994

    Quote Originally Posted by Jean Paula-Satire
    Never believe that the GOP and fellow bigots are completely unaware of the absurdity of their replies. They know that their remarks are frivolous, open to challenge. But they are amusing themselves, for it is their adversary who is obliged to use words responsibly, since he believes in words. The bigots and Republicans have the right to play. They even like to play with discourse for, by giving ridiculous reasons, they discredit the seriousness of their interlocutors. They delight in acting in bad faith, since they seek not to persuade by sound argument but to intimidate and disconcert. If you press them too closely, they will abruptly fall silent, loftily indicating by some phrase that the time for argument is past and that besides, they have already won

  3. #3
    Cassius's Avatar
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    I just helped a buddy finish his first AR build. He didn't want to stake his nut, so we went with torquing to spec and blue loctite. I'll be curious to see how it holds up.
    "No. Listen to me because I know what I'm talking about here." -- Hannibal

  4. #4

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    Quote Originally Posted by Cassius View Post
    I just helped a buddy finish his first AR build. He didn't want to stake his nut, so we went with torquing to spec and blue loctite. I'll be curious to see how it holds up.
    I've done this before on builds where parts were expected to change sooner rather than later. It should work fine as long as the loctite was given plenty of time to dry.

  5. #5

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    Don't forget to stake the carrier key as well.


  6. #6

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    Security Guard

    Quote Originally Posted by tgace View Post
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    One of the little details to look for in an M4/AR rifle is the "staking" of the castle nut on builds using receiver extension tubes. Staking prevents the nut from backing off under hard use. If that happens you may find your stock turning when you don't want it to.

    Staking is fairly simple. Once the castle nut is tightened to the appropriate torque, take a punch and tap some of the metal from the receiver end plate into one of the notches on the nut. If you need to remove the nut in the future you will have to punch the little tab of metal out of the slot and use one of the other staking slots on the nut when you put it back on.

    Your technique is definitely what I need because I really want to perfect my security guard job every time. Thank you so much.

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