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Thread: NSR 13.5 rail and BCM 16" upper. Something is crooked.

  1. #41
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    Quote Originally Posted by Robb Jensen View Post
    When I encounter this issue assembling uppers or installing these long rails two things fix the vast majority of them.
    Trueing the front edge of the receiver in front in front of the threads. I use the Brownells tool.
    Using a KAC Picatinny rail alignment block for holding the top rail in alignment with the upper receiver while tightening the rail or it's screws (on an NSR).
    If the rail uses a USGI type bbl nut many times using another bbl nut will fix it too. Some are truer than others.
    I took a Colt 6920 and swapped barrels and uppers with the nsr rail on each. The rail was perfectly centered on the bcm upper with the colt barrel installed. It was off center with the bcm barrel on the colt upper. This narrows it down to the barrel/extension.

    BCM asked me to return the whole upper. They've been awesome with communication about this. Any company can and does produce a lemon here and there, it's how they deal with it that counts.
    Last edited by 1911-A1; 09-01-13 at 23:23.

  2. #42
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    REPORTING back on my BCM 14.5" LW BHF middy:
    Just got it back and it appears to be a whole new upper...regardless, everything is as straight as an arrow.
    Awesome CS and a 12 day door-to-door turnaround.

  3. #43
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    Quote Originally Posted by evi1joe View Post
    REPORTING back on my BCM 14.5" LW BHF middy:
    Just got it back and it appears to be a whole new upper...regardless, everything is as straight as an arrow.
    Awesome CS and a 12 day door-to-door turnaround.
    That is great news! I'm glad it worked out well for you, and that BCM turned what could have been an unfortunate experience into something positive. Thank you for the update.
    Last edited by Tooth & Nail; 08-28-13 at 18:40. Reason: Correction.

  4. #44
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    Bcms a great company I'm sure they'll have everyone fixed up pretty quick.I want to use an nsr rail on one of their 20" uppers,hopefully this is just a fluke

  5. #45
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    UPDATE:

    I spoke with a gentleman at BCM who requested that I send the upper and NSR rail to them so they could evaluate the issue. Since I shaved down the FSB, I agreed to buy a low-pro gas block from them and they offered to assemble and test fire the rail and upper free of charge. I added a gunfighter comp to the order as well. I should point out that BCM doesn't typically offer assembly services, so this is a very generous gesture on their part.

    I got it back today and it appears to be a brand new barrel and possibly upper as well. The box was loaded with tons of their customary swag.

    The barrel and rail are laser straight and look beautiful. BCM's customer service is the industry standard as far as I'm concerned. Hell, I've spent time on the phone with Sony, trying to get a repair authorization for a $50,000 camera and was treated like a hobo. Muchos kudos to BCM.

    Last edited by 1911-A1; 09-26-13 at 15:17.

  6. #46
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    WoW! That is awesome. Rifle looks great from this angle.

  7. #47
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    I built an upper this year that has the same problem, it zeroed with a bunch of right windage. I'm guessing the upper receiver is out of true, but no worries, it's dead on with irons and Aimpoint at 200 yards.

    If it will zero, don't worry about it!

  8. #48
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    Quote Originally Posted by Failure2Stop View Post
    I wrote about this a while ago.

    Basically, the culprit is most likely your barrel extension or upper receiver.

    The dimensions of those areas are not required by spec to be at the level of straightness that you need to ensure that your barrel will be perfectly centered inside a floating tube.

    Still, it is not a functional issue, and if you can't get over it you can fix it with some work.


    Typos brought to you via Tapatalk and autocorrect.

    Obviously sights will be moved off-center to compensate, but will the lateral zero at 100m still be true at 500m? Or will it shift like a side-mounted optic or laser? Lots of angles and math get to me

  9. #49
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    Quote Originally Posted by WS6 View Post
    Obviously sights will be moved off-center to compensate, but will the lateral zero at 100m still be true at 500m? Or will it shift like a side-mounted optic or laser? Lots of angles and math get to me
    It should, the sights being off center will center the barrel itself with the target.

  10. #50
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    Just finished putting mine together. The 13.9" NSR clocked perfectly at 50 lb ft and the end of the rail is nicely centered on the barrel. Just a couple of clicks windage got her zeroed on the keyhole upper I mounted it to.
    What if this whole crusade's a charade?
    And behind it all there's a price to be paid
    For the blood which we dine
    Justified in the name of the holy and the divine…

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