AR 15 trouble.

This is a discussion on AR 15 trouble. within the Defensive Rifles & Shotgun Discussion forums, part of the Related Topics category; I have a bushmaster AR 15 that has taken a dump. The buffer spring detent and spring have somehow come loose and gotten chewed up ...

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Thread: AR 15 trouble.

  1. #1
    Senior Member Array joleary223's Avatar
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    AR 15 trouble.

    I have a bushmaster AR 15 that has taken a dump. The buffer spring detent and spring have somehow come loose and gotten chewed up in the bolt. I'm not sure what some other parts are called so I'm looking for a complete list of parts and a diagram of their locations to help me identify the missing or broken parts.
    Thanks for any help in advance.
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    VIP Member Array deadeye72's Avatar
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    Bushmaster -The World of Bushmaster - "The Anatomy of a Bushmaster"

    Not sure if this will help, but it is pretty cool. It has a parts list on it. When you highlight a part in the list, it highlights it in the image and shows what it does.
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    Senior Member Array HK Dan's Avatar
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    Go to Brownells.com and look at the technical drawings. The Brownells part numbers are right there and you can order very easily.

    Neither part will be hideously expensive.

    In the mean time--make sure your buffer tube is fully screwed in when you get the new part (that's what retains the detent), and don't over-tighten it. "Snug" is good.

    When you remove the stock to replace the buffer spring retainer, make sure you don't lose your detent for the disassembly pin. That is held in by the stock on the lower right side as you look at it.

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    Senior Member Array joleary223's Avatar
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    Thanks for the help guys. I got the info I needed.
    Oh! and I already lost the detent for the disassembly pin, that's the part I didn't know the name for. Thanks again.
    CRIME..... LAW DEFINES, POLICE ENFORCE, CITIZENS PREVENT!

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    BAC
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    That really sucks. Sounds like the tube itself backed out a little to let that little sucker go; I'd check your stock, too.


    -B

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    VIP Member Array aus71383's Avatar
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    That probably happened because your castle nut was not staked. When you reassemble it (I hope nothing is damaged) be sure to stake it so this can't happen again.

    Austin

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    Senior Member Array joleary223's Avatar
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    Quote Originally Posted by aus71383 View Post
    be sure to stake it so this can't happen again.
    Austin
    Explain please. I don't want to repeat the problem.
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    VIP Member Array aus71383's Avatar
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    When you're assembling the gun there are a couple parts that are supposed to be "staked" and not all companies do this. Basically what "staking" is - you take a dull type punch (lots of guys use a screwdriver with the end ground down) as your metal displacing device, and give it a few whacks with a hammer. Naturally you do this in a specific place to accomplish a specific purpose.
    On the bolt carrier group the gas key should be staked. There should be metal from the gas key displaced (via staking) that will preclude the gas key bolts from backing out.
    On the castle nut, the castle nut should be staked (once it has been properly torqued) be displacing some metal from the receiver end plate into the notches built into the castle nut for this very purpose. Be sure to displace the metal on the proper side of the castle nut - in other words, lefty loosey, righty tighty, so stake on the right side of the little notch.
    There are a lot better explanations (including pictures) on ar15.com and m4carbine.net

    Austin

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    Senior Member Array joleary223's Avatar
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    Thanks I'll check it out. I'm more up to speed with FN's than AR's, but I can be taught!
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    BAC
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    To build off Austin's excellent description, note the displacement of metal into the notch. This is an example of proper staking.



    I'll note that A1 stocks don't require this.


    -B

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    Senior Member Array joleary223's Avatar
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    That's a huge help, thanks.
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    VIP Member Array Ridgeline's Avatar
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    This is exactly the reason they make gun-smiths.
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