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Thread: Loose Barrel Nut

  1. #11
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    Quote Originally Posted by Iraqgunz View Post
    I am almost certain that the barrel nut was not tightened properly to begin with. I have seen it even on the VAUNTED Colt M4.

    I have not used this particular model before. Is there anything that prevents the handguards from rotating? Screws or anything? FWIW- I bought an open package Troy MRF from GandRtactical and it worked pretty damned good. I think it cost around 179.00.
    No anti rotation provision of any kind. Since this is a range toy/plinker for my son I was not worried about any real hard use. He is 6.

    The Troy has some lugs that protrude from in onto the upper reciever that keep it from rotating. The Larue and DD rails have their own anti rotation setup.

    I will re-install the MI rail since returning it to a standard M4 configuration will be problematic considering the FSB/taper pin issue.

    I feel pretty confident that once I properly torque it down to spec this problem won't happen again.
    "Run fast. Shoot straight. Die proud." -Boba Fett

    Trample the weak. Hurdle the dead.

    "Despite what your mamma told you, violence does solve problems." -Ryan Job

  2. #12
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    A very good friend of mine discovered a loose barrel nut from a kit sent from J&T a few years back when he went to do some work on it

  3. #13
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    I went down to my friends store, Bravo Arms in Colorado Springs. I told him about my issue and he gave me free reign of his workshop! Thanks Brian!
    I reinstalled the barrel using the original barrel nut and torqued it to spec. I can see now that the factory did not tighten it down properly. The now newly installed barrel nut sits two more notches over from the original location. I can see from where the gas tube has rubbed the original notch from being removed and reinstalled when I put on the FF rail.

    I doubt it will come loose again. I was tempted to put some red lock tite on it but decided against this. Proper torquing should work.

    I put it all back together gave it a test run. Works great. No more wobble.

    I guess I will have to use the parts I ordered to restore its factory configuration as the base for another build. I am sure builds have been started with less than a barrel nut, delta ring assembly and taper pins by others.

    Thanks for the help and advice to stay clear of attempting a FSB re-install.
    "Run fast. Shoot straight. Die proud." -Boba Fett

    Trample the weak. Hurdle the dead.

    "Despite what your mamma told you, violence does solve problems." -Ryan Job

  4. #14
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    Quote Originally Posted by Jimbo45 View Post
    You need a jig to properly set up and align the FSB with the index pin on the barrel extension, and a jig to reem out holes that are already there, and reem larger holes, and use larger pins, to end up with a properly aligned and set up FSB.

    The point is, it IS possible, but not by most folks, working out of their garage, using a bench vice. And to be done properly, by a shop, new parts are used....that is different than trying to match up a barrel and FSB, that has already been reemed and are mismatched.
    I saw a jig being sold recently that appears to be a block of steel to clamp the barrel extension and a t-shaped bar that goes out to align the FSB.
    I have not personally tried one of these, but it does not look like it's very solid.

    My FSB installation jig is built on a 1" thick x 5" wide fixture plate.



    Even with such a fixture, it's a pain to install a new FSB on a previously drilled/reamed barrel.
    It takes one setup to locate the centers of the old holes and then a 2nd setup with the new FSB in place to drill the new FSB.

    Even worse is installing a used FSB on a pre-drilled barrel.
    That's when I jump to oversized taper pins.
    Randall Rausch
    AR15 Barrel Guru
    California Precision Rifle Club founding member

  5. #15
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    Now I know why places like ADCO charge what they do for installing a FSB.

    Not as simple as I thought.

  6. #16
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    After discovering what a total nightmare it would be to install another FSB I really had no choice to reinstall the FF rail and lopro gas block. I shot another 200 rounds through it today and it is rock solid.

    I cant blame MidWest Industries at all for this issue. It was just one of those things that make owning an AR interesting. Should have been done better at the factory is all.
    "Run fast. Shoot straight. Die proud." -Boba Fett

    Trample the weak. Hurdle the dead.

    "Despite what your mamma told you, violence does solve problems." -Ryan Job

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