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Thread: Did BCM make a mistake on my rail?

  1. #11
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    It appears to be an Aero M4E1 enhanced upper. As for the rail not being level with the upper, if you look close in pic#2 I see the barrel nut threads. I don't think he has the rail over a barrel
    nut, causing misalignment.
    Last edited by ballen0032; 03-24-18 at 20:53.

  2. #12
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    I created some confusion (I added a note to my original post), the rifle is not assembled, so the gap is not a reflection of the handguard or upper fit, I simply put them together for an illustration. I do not anticipate any fit issues.

    It was just interesting the markings on the handguard, it just seems to me that on either my Spikes or Aero uppers a T16 marking should be the first on the handguard and not T14. I don't plan to even contact BCM, I am sure there is a reason for doing it the way they do and on my gun it will be mostly obscured by an optic anyway. The HG is beautiful by the way.

  3. #13
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    Oct 2014
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    Quote Originally Posted by Colorado S14 View Post
    it just seems to me that on either my Spikes or Aero uppers a T16 marking should be the first on the handguard and not T14.
    The correct (ala Mil-spec) is that the T-13 (unmarked) is the last slot on the picatinny top rail. Notice how the area above T-13 COULD fit another slot, but it doesn't. I don't know why it doesn't, but per the TDP it is uncut; thus T-13 is the last slot. See below for correct/mil-spec upper receiver...



    Last edited by sidewaysil80; 03-24-18 at 22:56.

  4. #14
    Join Date
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    Quote Originally Posted by GH41 View Post
    Are any of your rails BCM? Traditional rails with bottom clamp screws deform. BCM rails that clamp at the top do not. That is the beauty of their system.. The nut doesn't have to be timed and the rail doesn't deform.
    One is a BCM, and it sits below the receiver's rail the least. It barely does so, in fact. I shouldn't have included that rifle when I said they're level before they're tightened, because it's a factory BCM upper and I never saw it prior to being tightened.

  5. #15
    Join Date
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    I've seen a few "boutique" ARs with misaligned rails. I would ask DD to fix it.
    Last edited by stascom; 03-27-18 at 07:25.

  6. #16
    Join Date
    Mar 2008
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    Trying to get DD to fix a non-DD product/assembly seems like an odd piece of advice.
    Contractor scum, AAV

  7. #17
    Join Date
    Dec 2006
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    Quote Originally Posted by sidewaysil80 View Post
    For what its worth the picatinny on my colt upper receiver sits ever so lightly higher than the MI rail that it came with. It’s the Colt “Combat Unit Carbine”. Not sure who shit the bed on the that but it doesn't effect anything just annyoys me from an aesthetic point of view.
    Every Colt I've seen with an Centurion Rail (not MI) has had that issue. CCU's have Centurion Rails, not MI.

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