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Thread: Geissele SMR mkIV Barrel Nut: Is this normal?

  1. #11
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    Jan 2010
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    Re: Geissele SMR mkIV Barrel Nut: Is this normal?

    Do you guys set the torque wrench to the torque spec provided? You guys know that you need to recalculate the torque setting when you use a spanner tool, right?

    M1=M2 x L1/L2

    M1 is the torque setting of the wrench
    M2 is the actual torque applied to the nut
    L1 is the normal length of the wrench
    L2 is the extended length of the wrench (wrench + extension)

    So if your torque wrench is 10 inches long and you have a 5 in extension, you'll set your torque wrench to 20 ft-lbs to achieve a 30 ft-lb torque.

  2. #12
    Join Date
    Nov 2010
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    I thought I would circle back on this issue I was having. I was able to get a new wrench and barrel nut from Geissele Automatics thanks to their awesome customer care.

    I removed the barrel nut above using the previously untouched hole. There was a tiny amount if deformation on one side of the hole, but nothing nearly as bad as pictured above. The new wrench slides on and off the nut a bit easier than the one that was supplied with the rail. I am pretty sure the index pin on the first wrench was misaligned at least a little bit. Over torqueing may have done most of the damage, but the wrench didn't help the matter.

    I haven't had a chance to install a new barrel nut yet, as I want to calibrate my torque wrench first so I can see to what degree, if any, I was over-torqueing the nut in the first place.

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