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Thread: replacing stock on Colt M4

  1. #1
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    replacing stock on Colt M4

    I am in the process of replacing the stock on my Colt M4 LE. I have been having trouble removing the castle nut from the stock. I have tried with the tool and it didn't move. I then sprayed some break free on both sides and let it sit over night. the castle nut will still not turn. This is the original stock that came on the gun, so I'm guessing Colt uses some major torque! Any ideas would be greatly appreciated!
    thanks

  2. #2
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    Colt STAKES their castle nuts, as they should do... Look closely at the inside (closest to charging handle) of the castle nut. You will see two or three little dimples on the corner edge. See if the plate the nut holds in place has been staked. You will need a small punch to move that staking out of the dimple. Once the staking is removed it should unscrew without too much effort...

    Here is a thread about staking... Removing the stake is often trickier...
    Staking Comparison

    Rmpl
    Last edited by Rmplstlskn; 03-31-11 at 21:02.
    "Our destruction... will be from another quarter. From the inattention of the people to the concerns of their government, from their carelessness and negligence..."
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  3. #3
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    Can you tell us which tool you are using to remove it? I can highly recommend the Hammerhead AR tool- http://hammerheadrifletool.com/Hamme...Tool_Home.html

    Also, I cannot stress this enough. You need to secure the lower in a vise properly in order to remove it. If you dick around you run the risk of damaging it.



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  4. #4
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    I was using a tapco castle nut tool that I bought at Cheaper than Dirt. I had it in a vise and it wouldnt move. I will try looking for those stakes.
    Thanks for the advice!

  5. #5
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    Unless you have some seriously awesome plans for a rifle in mind, I would suggest leaving the mechanics of the rifle the way you bought it. You can do what you want with it, but there are modifications to the furniture that can be made that will leave the superior mechanics of the Colt system as is. This basic system, even with upgraded furniture, is still the standard and good for learners and experts alike.

  6. #6
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    May I ask why you are removing the entire RE? How are you locking the lower in the vise?

    Unless you are skilled enough to break the stakings with a tool, I would get the correct tool as I indicated above. If you put it on the nut and apply steady pressure it will break the stakings loose.

    Quote Originally Posted by mrtke423 View Post
    I was using a tapco castle nut tool that I bought at Cheaper than Dirt. I had it in a vise and it wouldnt move. I will try looking for those stakes.
    Thanks for the advice!



    Owner/Instructor at Semper Paratus Arms

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  7. #7
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    .

    What stock are you going to install?

    .

  8. #8
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    Secure upper, use a tool that engages at least 3 slots on the castle nut, and use a big rubber mallet to tap the tool. Make sure the castle nut tool is square and in good engagement with the slots on the castle nut.



    If that doesn't work to loosen it put a pipe over the handle on the tool and use it like a breaker bar.

  9. #9
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    Are you just switching stocks?

    If you just want to replace the original stock with another one, you do not need to remove the Receiver Extension or the Castle Nut.

    To remove the stock pull down on the adjustment piece, while holding it down, slide the stock off to the back.

    Reverse the instructions to install your new stock.

  10. #10
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    Sounds like he wants to swap stocks, not tubes.

    mrtke423, you can actually pull the lever on the bottom of your Colt M4 stock in the opposite direction as you would normally when you adjust it, and pull it off the rear of your rifle.

    So you basically want to do this:

    1. Pull down on the front of the stock lever—don't be afraid to pull with some force.
    2. Slide the stock off the rear of the tube as you are pulling it down.

    You can slide your new stock on the extension in the opposite way, without removing the factory staking or taking off the tube.

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