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Thread: tighten the carry handle on the m4

  1. #21
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    Here is my thought. I currently have a cut down carry handle BUIS on one carbine and have had carry handles on others over the years. They never came loose. Maybe there is some overthinking going on?



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  2. #22
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    Asimple torque wrench goes a long way for consistency. IIRC.. All mine say 65 inch-pounds for rail mounted devices. I normally use 45 inch-pounds.. Just because.. Cheers.. Ron
    Ain't no pockets on a shroud..

  3. #23
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    Quote Originally Posted by Iraqgunz View Post
    Maybe there is some overthinking going on?
    It's the stuff the internet is made of.
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  4. #24
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    Simple really, just like any other fastener.. Read the spec and torque accordingly.. doesn't matter much exactly what it is.. LMO.. Ron
    Ain't no pockets on a shroud..

  5. #25
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    Quote Originally Posted by Kokopelli View Post
    Simple really, just like any other fastener.. Read the spec and torque accordingly.. doesn't matter much exactly what it is.. LMO.. Ron
    The torque spec on my ACOG mount per the manual is "tighten to finger-tight, then use a screwdriver or coin to tighten an additional 1/4 to 1/2 turn".

    I normally follow torque specs very closely, and extensive mechanic experience from my years of racing have taught me an intuitive feel for how a threaded fastener is responding to tension, even beyond correct use of torque wrenches (fatigue can cause failure well below specs). This experience certainly helps even with more mundane tasks like this, but I don't know what is specified for these screws.
    Last edited by everyusernametaken; 06-23-12 at 06:04.

  6. #26
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    Judging from this thread, and my post above from five years ago, I may have gradually developed the habit of tightening mine more than needed. I used to not do that.

    I used to just hand-tighten then go past hand tight a little with a quarter, but somewhere along the line I started tightening until the nuts won't go any further because they loosened a couple times on my ACOG.

    Lately, I've used a pair of slip-joint pliers to hold the quarter to tighten each nut all the way down until it stops. My ACOG came with the thumb nut mount, and particularly, the mount would eventually loosen from firing without torquing the nuts all the way down. I came back from the range a couple of times before I started cranking all the way down and the ACOG mount had actually loosened enough that I could turn the thumb nuts freely. I started putting a drop of nail polish on the threads before cranking down and never had any further problems. (I've since switched to an American Defense quick detachable mount for the ACOG).

    So I may be inadvertently tightening too far on the carry handle. I've never noticed that this radical overtighteniing has damaged either the upper receiver or the clamp components, but maybe I should go back to just hand-tightening and go just past hand tight but more than I used to? Hmmmmm?
    Last edited by Doc Safari; 07-05-17 at 17:31.

  7. #27
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    You are in the Top 10 spot for Necropost of 2017.

    Quote Originally Posted by Doc Glockster View Post
    Judging from this thread, and my post above, I may have gradually developed the habit of tightening mine more than needed. I used to not do that.

    I used to just hand-tighten then go past hand tight a little with a quarter, but somewhere along the line I must have had one loosen after doing that.

    Lately, I've used a pair of slip-joint pliers to hold the quarter to tighten each nut all the way down until it stops. My ACOG came with the thumb nut mount, and particularly, the mount would eventually loosen from firing without torquing the nuts all the way downr. I came back from the range one day before I started cranking all the way down and the ACOG mount had actually loosened enough that I could turn the thumb nuts freely. I started putting a drop of nail polish on the threads before cranking down and never had any further problems. (I've since switched to an American Defense quick detachable mount for the ACOG).

    So I may be inadvertently tightening too far on the carry handle. I've never noticed that this radical overtighteniing has damaged either the upper receiver or the clamp components, but maybe I should go back to just hand-tightening with a little more? Hmmmmm?



    Owner/Instructor at Semper Paratus Arms

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    Master Armorer/R&D at SIONICS Weapon Systems- http://sionicsweaponsystems.com

  8. #28
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    Quote Originally Posted by Iraqgunz View Post
    You are in the Top 10 spot for Necropost of 2017.
    Thanks, I do it just for you cuz I know you appreciate it.

    (And if I'd started a new thread, you'd have said, "Why did you start a new thread. Didn't you do a search?")

  9. #29
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    It's good to see not a lot has changed in the last 7 years

  10. #30
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    Quote Originally Posted by tehpwnag3 View Post
    It's good to see not a lot has changed in the last 7 years
    Other than they stopped putting carry handles on the 6920 from the factory....

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