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Thread: Question about Receiver extension torque

  1. #11
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    It never occurred to me that one can tighten the castle nut too much, but I guess you can tighten anything too much, but its not like I used a 4' pipe as a lever.

  2. #12
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    you can certainly tighten it too much. Steel threading into aluminum is usually a recipe for galling if you over tighten. Moly grease or some sort of anti-seize compound CAN save you from galling the threads. Your best bet is to stick with specified torque or good and snug, then properly stake in two places. No need for blue-star torque on these things.

  3. #13
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    I was installing a rifle extension and looked in the manual to see how tight to go. Just out of curiosity, I checked the carbine specs and thought 40 +/- 2 in-lbs seemed a little loose. You can just about do that by hand with no wrench.
    The devil danced as he went down
    In the hail of arrows comin'
    Out on the wild Montana ground,
    Custer died a-runnin'.

  4. #14
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    Quote Originally Posted by Scattergun View Post
    I was installing a rifle extension and looked in the manual to see how tight to go. Just out of curiosity, I checked the carbine specs and thought 40 +/- 2 in-lbs seemed a little loose. You can just about do that by hand with no wrench.
    Well if that's the case then mine is WAY too tight. Oh well. I have already staked it twice, so I don't think I will do it again.

  5. #15
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    I have never used Moly, has anyone run into trouble with not using on the threads?

  6. #16
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    Specs from the Colt classes I've taken;

    35-39 ft-lbs (Fixed Stock)

    38-42 ft-lbs (Sliding Stock)
    If it isn't durable, it isn't reliable.

  7. #17
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    40 ft lbs is alot of torque.

    Think about this people. You have a lever that is 1 foot long with a 45 pound plate hanging off of it. This is alot of torque for such small aluminum parts.

    This is the torque that lug nuts are put on vehicles.

    You just need to tighten this snuggly and stake it be be done with it.

    I don't consider torque specs to be very valuable.

    I don't torque barrel nuts to a specific spec. I hand tighten them and align the next notch on the barrel nut via the wrench. This is tight enough. You cannot torque to a specific spec on the barrel nut because it has to stop at a discrete position unlike standard fasteners.
    "Not every thing on Earth requires an aftermarket upgrade." demigod/markm

  8. #18
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    I'm just posting what Colt recommends.
    If it isn't durable, it isn't reliable.

  9. #19
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    Quote Originally Posted by scottryan View Post
    40 ft lbs is alot of torque.



    This is the torque that lug nuts are put on vehicles.

    .[/B]


    my Magnum's lugs torque to 100-110 ft-lb
    The devil danced as he went down
    In the hail of arrows comin'
    Out on the wild Montana ground,
    Custer died a-runnin'.

  10. #20
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    I emailed Ken Elmore of Specialized Armament and here is what he emailed back.



    I use 35 ft/lbs, fixed stock, and 40 ft/lbs, sliding stock.
    The only INCH / pound spec on the M16 is the carrier key.

    Hope this helps.

    Run-N-Gun,

    Ken



    Ken Elmore
    Specialized Armament (1990 - Present)
    Instructor, COLT Defense (1997 - 2007)
    Sergeant, US Army (1986 - 1990)
    The devil danced as he went down
    In the hail of arrows comin'
    Out on the wild Montana ground,
    Custer died a-runnin'.

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