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Thread: DD Rear BUIS dialed all the way to the left when zeroed.

  1. #11
    Join Date
    Dec 2010
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    It's not the rear sights fault, you either got a canted front sight post or the barrel is off.

    I got a Spikes middy upper on trade and the rear sight needed to be adjusted left. (about center of full left and center) I called spikes and they said send it in , Gave me a call tag via e-mail in an hour for free shipping and didn't care I got it used.

    I figured they would just wack the front sight post over but they sent me a BRAND NEW upper with new Bolt , CG and charging handle. SONOFABIOCH! It came back tested dead on with my sight attached.

    Good look with Colt doing that. But give them a call anyway.

  2. #12
    Join Date
    Oct 2010
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    Denver, Colo
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    I had this issue with my 6720 I recently picked up. I had to run the rear sight all the way to the left just to center it at 25 yards. Colt sent a shipping tag for it and fixed it. I just got it back last week and it shoots fine now. As far as I'm concerned, Colt has great customer service. Give them a call - I'm sure they'll treat you as good as they did me.

  3. #13
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    Oct 2009
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    Barrel is not aligned properly in the receiver. It needs to be removed and reinstalled.

  4. #14
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    May 2010
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    Quote Originally Posted by MK18Pilot View Post
    Barrel is not aligned properly in the receiver. It needs to be removed and reinstalled.
    You're saying that you think there's too much slop in the indexing pin and the barrel got rotated to the left too much when the barrel nut was torqued down?

  5. #15
    Join Date
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    Quote Originally Posted by MK18Pilot View Post
    Barrel is not aligned properly in the receiver. It needs to be removed and reinstalled.
    I will second Hmac's comment. I am not the OP, but did post in this thread, about the same issue, and mine being caused by a canted FSB. In my case, it is not an issue of barrel index. I tried two different upper receivers on this barrel, and both had normal sized index slots, with the normal, very tiny amount of clearance around the index pin. I have put together many, many uppers, and in fact, have never seen an index pin slot in an upper receiver, that would allow the barrel to rotate in the receiver far enough, to make the FSB as canted as the one on my particular case. On my barrel, the index pin on the barrel extension, is not inline with the FSB. I suspect this is the OP's problem as well.
    Last edited by Jimbo45; 03-04-11 at 09:01.

  6. #16
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    Oct 2009
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    Quote Originally Posted by Hmac View Post
    You're saying that you think there's too much slop in the indexing pin and the barrel got rotated to the left too much when the barrel nut was torqued down?
    Not to much slop... The clearance between the index pin and the index slot in the receiver is not a slip fit. There is an allowable tolerance. When the barrel nut is torqued, it moves the index pin against the left side of the index slot. The index pin needs to be centered in the index slot.

    If the FSB was installed correctly at the factory, there is nothing that can be done to fix the problem unless you are willing to apply a fat roll of cash to the problem.

    The DD fixed BUIS may be the culprit also.

  7. #17
    Join Date
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    LOL. I bought a set of DD A1.5's from a private seller and when they arrived, the rear was adjusted all the way left as well.

  8. #18
    Join Date
    Feb 2011
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    And i was worried that mine was 4 clicks left of center....

    Ironically, my red dot was out of the box centered.... Not a single adjustment required.

  9. #19
    Join Date
    Jan 2008
    Location
    AZ-Waging jihad against crappy AR's.
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    This conversation sounds real familiar? Didn't we discuss this recently?

    Quote Originally Posted by MK18Pilot View Post
    Barrel is not aligned properly in the receiver. It needs to be removed and reinstalled.



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  10. #20
    Join Date
    Jul 2009
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    Texas
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    My fixed troy rear sight's aperture needed a bit of adjustment too to get it zeroed. It is at the 2nd dash to the left. This is on a BCM Upper, never been messed with. In hind sight I guess the 2nd dash isn't too bad...

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