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Thread: Barrel nut question

  1. #1
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    Barrel nut question

    Are there any issues with tightening the barrel nut with the barrel clamped and the upper floating
    as opposed to clamping the upper and tightening the nut?
    Thanks

  2. #2
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    Not sure if I understand your question...you're asking if you can do it backwards? Standard procedure is using a vice, block for receiver, secure receiver in block, tighten vice, then tighten barrel nut to spec (30-80ftlbs) while aligning holes for gas tube. That's the way I do it, never tried to clamp the barrel and tighten...
    Last edited by munch520; 09-29-11 at 08:23.

  3. #3
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    It wont work. Go into your kitchen and try screwing the top onto a jar without holding the jar itself. See what happens when the lid starts to get tight. That's effectively the same as what you are talking about.

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    Quote Originally Posted by munch520 View Post
    That's the way I do it, never tried to clamp the barrel and tighten...
    That's the way I do it also but my upper clamp is on "loan" and I have barrel clamps
    Never heard of doing that way so was curious..

    Eric,
    Wouldn't the indexing pin(?)on the barrel ext that goes in the notch on the upper prevent that?

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    Quote Originally Posted by Bsully View Post
    Wouldn't the indexing pin(?)on the barrel ext that goes in the notch on the upper prevent that?
    You don't want all that force on the index pin. It'd gouge the relatively weak notch in the upper or just shear off the pin.

    Bad idea.
    "You people have too much time on your hands." - scottryan

  6. #6
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    Quote Originally Posted by markm View Post
    You don't want all that force on the index pin. It'd gouge the relatively weak notch in the upper or just shear off the pin.

    Bad idea.
    I was forgetting about the index pin, honestly, but this correct. It's not made to take that much force. Good opportunity to buy a receiver block, maybe?

  7. #7
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    Quote Originally Posted by Bsully View Post
    Are there any issues with tightening the barrel nut with the barrel clamped and the upper floating
    as opposed to clamping the upper and tightening the nut?
    Thanks
    Yes... Don't do it. There is a high probability that you will shear off your index pin.

  8. #8
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    Not gonna do it.
    Thanks!!

  9. #9
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    I agree with the others, a receiver block is better.

    However.....securing the barrel will work as it is even the described method in the army technical manual. I think you'd have to be unlucky to shear the pin - but I'd still advocate a receiver block.

    Dan

  10. #10
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    you'll get Al scuffs on the outside of the barrel that will take time to remove.

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