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Thread: POI Variance Between Uppers

  1. #1
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    POI Variance Between Uppers

    I have two 16" mid-length 1:7 twist uppers. When I take an Aimpoint in a LaRue mount that's been zeroed on one of the uppers and put it on the other upper it shoots about 6-8 MOA left with no vertical POI shift, using the same ammo.

    I'm just curious if this is a typical amount of variance in POI between uppers? I'm not expecting the Aimpoint to be dead on when switching between uppers, I just would have thought there'd be less of a variance between such similar uppers. The Aimpoint does return to zero when put back on the first upper.

  2. #2
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    Completely normal. Way more things come into play that just similar barrel/uppers.

  3. #3
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    If this drives you batshit crazy, buy MRPs....

    I can QD a NXSc from one chassis(rifle)...place it on a totally different chassis(rifle), and have absolutely zero windage shift. I still have elevation shift given I'm running different barrel lengths. MRPs are freaks
    Last edited by ALCOAR; 11-21-11 at 03:40.

  4. #4
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    I have a 12.5" and had a 16" middy with both using Vltor MUR receivers. My Aimpoint on a Bobro mount didn't show any windage shift between the two. Is the 6-8" shift repeatable?


    Here is the optic with a 100 yard zero from my 16". These were my first three shots at 25 yards with the brand new 12.5" upper.
    Last edited by johnson; 11-21-11 at 09:52.

  5. #5
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    you should not expect an optic zero'd on one upper to be zero'd on another.

  6. #6
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    Thanks for the replies everyone. I certainly wasn't expecting the two uppers to have the exact same zero. I was just surprised that there was this much of a variance. I guess I was just expecting them to be a bit closer, but I don't know what's a typical amount of variance between uppers.

    johnson, yes the shift is repeatable. I actually checked with both a CompM2 and T-1 and both had the same amount of shift.

  7. #7
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    Quote Originally Posted by TRIDENT82 View Post
    If this drives you batshit crazy, buy MRPs....

    I can QD a NXSc from one chassis(rifle)...place it on a totally different chassis(rifle), and have absolutely zero windage shift. I still have elevation shift given I'm running different barrel lengths. MRPs are freaks
    How does that work technically speaking? Thats very interesting.
    I was amazed that my larue mount kept a zero after removing it and replacing it on the SAME rifle.

  8. #8
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    I was amazed that my larue mount kept a zero after removing it and replacing it on the SAME rifle.
    Why are you amazed? That's what they are designed to do.
    I'm no expert, but I took my CCW course at a Holiday Inn Express

  9. #9
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    I'm sure that a lot comes into play. I have seen a 2" shift to the left at 100yds between an LWRC and a M&P15T.

    I walked away with the assumption that the two rifles would have close POI's, but I'd be mistaken. Just curious, what kind of hand gaurds? Both were free floated in my case.

  10. #10
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    ..... using a compM4s w/ larue mount.

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