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

  1. #31
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    I subscribed because I was curious in hoping that they would find the true cause of this..fail lol. Glad you got it worked out though.

  2. #32
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    I have installed several NSR rails. I have found a few of them to be crooked. Troy Alphas and NSRs are extrusions and this is common in those types of products. A machinist for a very well known company that many people on this board buy from, showed me how to look for crooked extrusions...
    "Perfect Practice Makes Perfect"
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  3. #33
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    This thread is very much making me reconsider the sum total of my in progress 6.8 build. I've yet to purchase the barrel and forend. I was down to an NSR (preferred) or Troy Alpha with integral front BUIS.

    The parts bin currently has a Vltor VST-1P sight tower/gas block I picked up on sale. I think whatever forend I choose will be notched to utilize this piece. Off center sights trigger my OCD, badly.

  4. #34
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    I'd say it'll definitely present a problem when and if you mount irons. You'll more than likely run out of room on the windage knob.
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  5. #35
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    Quote Originally Posted by Slippers View Post
    My 4 year old BCM upper had the exact same problem. Regardless of the rail system/barrel nut, it was misaligned. It also had other issues, so I replaced the upper receiver, which took care of it.

    When I originally purchased it from BCM, it also had a slightly canted FSB (to the left, when looking down the rifle while firing).
    My 14.5 upper was the same way. Canted fsb. The rifle ran great an held zero with lots of Windage adjustment.
    Just wasnt expecting to look like that coming from bcm.
    I understand a cheap wasr-10 ak to have canted sights on it. Not a quality bcm upper ? Gun still ran great, just little annoying tid bit I guess.

  6. #36
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    Quote Originally Posted by evi1joe View Post
    It probably will sight in with lots of extra windage.
    I'm worried about mine because I tend to only lose 2MOA vertical when I switch the TR24G between my two old uppers...I sold one to get this, so I'd hate to have to crank the windage 30 clicks one way and back switching uppers.

    Did they offer to replace or repair it, or just suggest you shoot it?
    Wait, hold on. Why would rail barrel alignment matter with an optic, unless your mounting it so far forward it's on the rail instead of the upper? I would think you would run out of eye relief before then.

  7. #37
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    glocktogo:
    I've had two NSRs, a Troy extreme and Alpha--all were GTG. There's like a .02% chance you'll have any problems.

    foxtrot:
    IF the barrel/upper is crooked, then moving my acog or T1 from a straight upper to a crooked upper/barrel would mean my optics would be off...I mean, I don't move the T1, but I remove it and use the acog on that upper some and it's just off a tad with the two current uppers/ARs, BUT I only have to adjust elevation 8 clicks and I'm back on (so far!).
    If my new upper comes back still out of whack, and I kept it, I bet I'd have to do a lot more windage adjustment than I'd like.
    Last edited by evi1joe; 08-28-13 at 01:13.

  8. #38
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    Quote Originally Posted by evi1joe View Post
    glocktogo:
    I've had two NSRs, a Troy extreme and Alpha--all were GTG. There's like a .02% chance you'll have any problems.

    foxtrot:
    IF the barrel/upper is crooked, then moving my acog or T1 from a straight upper to a crooked upper/barrel would mean my optics would be off...I mean, I don't move the T1, but I remove it and use the acog on that upper some and it's just off a tad with the two current uppers/ARs, BUT I only have to adjust elevation 8 clicks and I'm back on (so far!).
    If my new upper comes back still out of whack, and I kept it, I bet I'd have to do a lot more windage adjustment than I'd like.
    After reading the thread I thought the rail receiver alignment was the issue, not the barrel. I may be reading wrong.

  9. #39
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    Wouldn't that just be solved by using a carry handle or something to hold them aligned while installing the rail?

    I think his barrel is off-center with the rail, but he has to narrow down where the problem lies--I'm betting it's not the rail or nut...I'm betting it's the upper, the upper's threading or barrel.

    "A machinist for a very well known company that many people on this board buy from, showed me how to look for crooked extrusions..." -- ARE YOU GONNA TELL US? ;o) I don't even know what an extrusion is...the NSR barrel nut seems easy to make straight, and I'd think if it was gtg, the rail would be gtg.
    Last edited by evi1joe; 08-28-13 at 05:01.

  10. #40
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    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.
    Chief Armorer for Elite Shooting Sports in Manassas VA
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