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Thread: "three snugs" barrel install method?

  1. #11
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    FWIW - The three snugs method comes straight out of the USMC M16A2 Maintenance manual.

    I snug to 30ft/lbs 3x, then tighten to align to the next gas tube slot. Though I've only installed 6 AR barrels, I've not had a problem with this procedure.

    Always, always, use anti-seize on the threads, even if test-fitting. Steel nut on aluminum threads is bad ju-ju if not lubed, and a good way to learn about galling. A few cents worth of anti-seize is cheap insurance against a ruined upper.

  2. #12
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    Torque specs on these I have come to realize are a waste of time.

    Wide variations in factory torques I have noticed over the years. If it is tight enough and it is aligned it is fine.

    All a torque wrench does if increase the chances of pulling the wrench off the barrel nut and bending teeth.
    Last edited by scottryan; 12-29-09 at 02:00.
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  3. #13
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    When I started playing/building AR's I bought all my tools, including a snap on torque wrench. The wrench hasn't been used for a few years. I apply anti sieze, snug them up 3 times and tighten to next slot. As noted above on occasion you have to tighten/loosen more than 3 times. With the DD nuts I tighten/loosen 3times then just snug them up and go. Over the years I've kind of got a feel for how tight is tight enough and go with it. I suppose I should get the torque wrench out for the DD type nuts but haven't had any issues without it.
    "The peace we have within us is most often expressed in how we treat others"

  4. #14
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    Moly-B on the threads, then the previously mentioned 3x method, tightening to alignment on the last. Fourth time, if necessary. No torque wrench unless required.
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  5. #15
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    What type of anit-seize are you guys using? Does the type matter?

    Jeremy
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  6. #16
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    I had a question about this myself. Would there be any possible, logical reason why I couldn't use nickel-graphite anti-seize?

  7. #17
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    I believe I use the loc-tite brand from Brownells.
    "The peace we have within us is most often expressed in how we treat others"

  8. #18
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    Quote Originally Posted by The_Katar View Post
    I had a question about this myself. Would there be any possible, logical reason why I couldn't use nickel-graphite anti-seize?
    Can't tell you the science behind it, but I've been told that graphite lubes will facilitate galvanic corrosion. I use the molybdenum disulfide paste that comes in the little white jar.

  9. #19
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    Quote Originally Posted by J Krammes View Post
    What type of anit-seize are you guys using? Does the type matter?

    Jeremy
    A friend of mine used to work at a Mercedes Benz dealer and liberated several tubes of their anti-seize and I like to use that for all kinds of things.

    The anti-seize sold by Permatex, Loctite, whoever dries out after a period of time. The MB uses a molly based grease in their anti-seize and it doesn't dry out. You can really feel the difference when you thread a nut on or install a bolt in something.
    Last edited by EzGoingKev; 12-29-09 at 19:08.

  10. #20
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    I just had to get a new barrel nut from LaRue as the one that came with the HG was <35 at 1st hole alignment and would not move any farther at 80. The new nut fixed it. I use Brownells barrel paste for the threads and used a technique similar to GotM4's and it went to the next hole around 80 and lined up perfectly!

    Sparky
    "An opinion solicited does not equal one freely voiced," Al Swearengen, Deadwood 1877.

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