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Thread: Loose Barrel Extension Help

  1. #11
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    I am not a gunsmith but the only reasons I've seen to use a barrel vise is to not damage the index notch on the upper receiver. I've never seen a barrel unthread when taking off a muzzle device besides the issue with DSA uppers a while back.

  2. #12
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    I'm not a gunsmith, but even I have the basic common sense not to torque on the muzzle with the upper on/in a block.
    "You people have too much time on your hands." - scottryan

  3. #13
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    I always chuck the FSB in a vice sandwiched between two wood scraps when I am screwing with muzzle attachments. I never put Torque on the reciever end.



    I wonder if somebody loc-tited your flash hider?
    My brother saw Deliverance and bought a Bow. I saw Deliverance and bought an AR-15.

  4. #14
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    Quote Originally Posted by Belmont31R View Post
    Then they broke the pin allowing the barrel to come loose off the barrel extension.
    The pin does not go into the barrel, only the extension.

    I believe its only function is to index the extension straight up into the receiver.
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  5. #15
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    I know there are many people who have torqued on a flash hider using a receiver block. Granted the proper way is to use a barrel vise, but on isn't as big of a deal as off.

    Through the effects of heat, carbon, over-torque, loctitie etc, the flash hider may require significant more torque to break it loose than the 20ft-lbs to put it on. Crush washer could have been improperly installed...improper torque on the barrel extension could have been as issue as well.

    Have you set the barrel in a vise and removed the flash hider? How easily did it come off or did it require a lot of effort? That could tell you a bunch.

    The gunsmith should have used a barrel vise...but I wouldn't have expected that to happen either...

  6. #16
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    I once used 2 blocks of wood in a vice to hold my upper(with some additional cushion) while I torqued my barrel nut, then you know what I did? I torqued the flash hider with the same set-up all with success and no issues and the earth did not shake! I have since obtained the proper tools though

  7. #17
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    I agree the wrong tools were used in this case,but I also suspect the barrel extension was not properly torqued.Don't think I'd buy that brand again either.
    As a note,just for shits and giggles I tried to remove a barrel extension from a damaged barrel once.Granted it was an old and abused barrel,but I almost blew an oring out trying to break the thing loose.And Im a large ham fisted knuckle dragger.So yeah I'd be a little disturbed if the barrel unscrewed from the barrel extension by turning the FH.
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  8. #18
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    All the bullshit aside. The issue I believe (using my Remote Viewing Techniques) since I wasn't there was that the barrel extension was not properly torqued to the barrel.

    Now to the "mom and pop" operation. You need to have the right tools for the right job. That means the ability to secure the barrel when removing and installing a flash hider. If it's your own personal weapon and you feel comfortable using a receiver block then by all means do so, and understand the risks as Belmont has pointed out.

    Any gunstore that says working on AR's is a piece of cake needs to be scrutinized. The first question I would ask is where is their armorer certification and how long have they been working on them.



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  9. #19
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    Quote Originally Posted by Clint View Post
    The pin does not go into the barrel, only the extension.

    I believe its only function is to index the extension straight up into the receiver.
    I believe that you are right Clint. I found an old post from randall @ AR15barrels.com that reads...
    "The industry standard pin is a 1/8" diameter dowel pin that's 3/16" long.
    This presses into the hole provided in the barrel extension.
    There is typically no hole drilled into the barrel at all.
    The pin just presses into the extension and is held there by the press fit."


    I see where the OP is scratching his head. The torque applied to a properly installed barrel extension "should" be enough to hold against the relatively small amount of torque required to loosen a flash hider.

    But, as others have stated, the barrel should have been supported during this operation. I don't have a barrel block, so when working on a barrel with a standard front sight, I insert a object through the sight tower to provide leverage in the oposite direction.

    -Matt
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  10. #20
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    Always fixture the barrel when removing installing a muzzle device. The barrel was not assembled properly to begin with. Your barrel is a loss as very few shops have the proper tooling and fixtures to repair it.

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