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Cant sight in AR

Discussion in 'Black Rifle Forum' started by bigdough666, Jan 26, 2011.


  1. bigdough666

    bigdough666
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    Long story short, I cannot get my AR sighted in. Its a flat top upper with YHM BUIS setup. The gun shoots tights groups centered but about 3" to the right. Either way I adjust the rear sight, the gun still hits in the same spot which is what is freaking me out. I can adjust all the way to the right, hits right, all the way left, hits right. So, is my gun/barrel messed up or are the sights bad?? Should I take them off completely and start over? Or buy a new set and start over?? What sight do you guys recommend if so? I was thinkin Magpul. Any help would be appreciated, thanks.


    BTW - before you suggest its the shooter, I had 2 of my friends shoot the gun also with the same results.
     

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  2. Jeff82

    Jeff82
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    How's your flash hider/muzzle break looking? Not loose or got any shiny spots on the inside, does it?
    Crown look good?
    Sights are tight like they're supposed to be?
    Rear aperture moving in accordance with how much you adjust it?
     

  3. Camu Mahubah

    Camu Mahubah
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    Can you take the upper off the gun and the bcg out and then look down barrel and at an object at I dunno as close as you can estimate to 25m...then make sure the barrel doesn't move and then look through the rear sight. This is what I had to do to get my AR zeroed. Well at least it was the start of the process.

    I wouldn't change the sight just yet...

    Some ammo likes to shoot to the right in my gun...but yes I have seen that sight and isn't it based on metal tension to grip the gun?

    That's some late night advice there...I hope I made sense...I'll check back in the AM...
     
  4. K. Foster

    K. Foster
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    What distance are you shooting? Are you sure the rear aperture moves when you adjust it? When you make adjustments, does your point of impact change at all?
     
  5. Another Miller

    Another Miller
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    Sounds like a sight issue.Something is slipping back each time you fire it.



    Id try a different sight, like a red dot.
     
  6. bigdough666

    bigdough666
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    Whoa lots of info.

    I'm at work so I can't check the rifle now, I'll check it when I go home.

    To answer some questions, I'm shooting right now around 25 yards, just to get a feel for the rifle.

    As far as I can tell, the sights are on nice and tight.

    I'm sure the sight is moving when I make adjustment, it's a drastic change from all right to all left.

    No change in the poin of impact what so ever. It hits dead center but 3" to the right. Adjust the rear sight left or right, no change.

    I am evetually goin to an ACOG setup but I want the BUIS accurate as well.
     
  7. BBJones

    BBJones
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    Is this @ 25, 50, 100 yards?

    Because you are getting tight groups sounds like the sight is not adjusting. Do you have access to any other sights that you can test this theory?
     
  8. K. Foster

    K. Foster
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    If you are moving the rear sight to it’s left and right limits, and it doesn’t effect your point of impact... either the sight isn’t moving as it should or you are doing something wrong, no offense intended. What diameter are your groups and how many shots in a group.
     
  9. expatman

    expatman
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    I agree with the above post. It should be physically impossible to move the sights from the extreme left to the extreme right and not have a change in POI. There has to be something missing in the description of the problem.
     
  10. Flashbang1063

    Flashbang1063
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    I don't even know how that is possible if the rear aperture is actually moving.

    Are you sure the rear sight aperture is moving and it's not just the adjustment screw turning? Place a mark on the aperture and the sight base to see if it is moving.
     
  11. DeltaNu1142

    DeltaNu1142
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    Are you using only the close-range aperture? Try the distance one. It could be that your eyes are "fuzzying" the rear sight enough that you're not centering the front sight in the aperture... although that seems pretty far-fetched. It's the only thing I can think of if everything you're saying is true.
     
    #11 DeltaNu1142, Jan 27, 2011
    Last edited: Jan 27, 2011
  12. bigdough666

    bigdough666
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    [​IMG]
    [​IMG]

    [​IMG]
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    Yup, pretty sure its moving. Thats whats freaking me out the most. Doesnt make any sense at all.

    Checked out the gun. Flash hider is good, not loose, no shiny spots. Both sights are nice and tight.
     
  13. bigdough666

    bigdough666
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    Hell, just looking at those pics I just posted, does that rear right look crooked?? Maybe its just how im holding the gun, i dont know.
     
    #13 bigdough666, Jan 27, 2011
    Last edited: Jan 27, 2011
  14. MisterPX

    MisterPX
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    Lookslike your sight moves fine, which can only mean one thing, teh shooter. Your freinds shot it at one extreme, as well as the other, and had teh same no change on POI?

    ETA: Are you sure that's a YHM sight? Retention knob know looks like nothing I've ever seen on their stuff. Also, haven't seen a sight like that on their website.
     
    #14 MisterPX, Jan 27, 2011
    Last edited by a moderator: Jan 27, 2011
  15. bigdough666

    bigdough666
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    YUP. Made all kinds of adjustments, no change at all.
     
  16. bigdough666

    bigdough666
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    Im actually not. I know the front is for sure, figured they were a matching pair. I bought the upper with the sights on it already. :wavey:
     
  17. Flashbang1063

    Flashbang1063
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    I gotta' say...it isn't even my AR and I'm going crazy trying to figure this one out.

    What brand upper are you running?

    Maybe...not sure if this would cause no shift in your POI when adjusting your rear sight, but maybe the front sight is slightly canted.

    Did you assemble it yourself? Maybe the barrel is over/under torqued causing the entire barrel to be off?
     
    #17 Flashbang1063, Jan 27, 2011
    Last edited: Jan 27, 2011
  18. StevieJ

    StevieJ
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    It almost appears as though it isn't mounting directly on the middle of the rail.
     
  19. DeltaNu1142

    DeltaNu1142
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    That makes no sense.

    I believe you're absolutely sincere in your post, but looking at your fifth photo, given no other changes, I'll bet Dr. Kenneth Noisewater that I'd hit the opposite side of the paper if I moved the rear sight to the other extreme.
     
  20. MisterPX

    MisterPX
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    Now this is getting freeky deeky weird. A rear sight shift of a 1/4 inch shooting at 25M sould have a profound impact on the POI.


    ETA: since I didn't see it mentioned, how big were your shot groups at 25?
     
    #20 MisterPX, Jan 27, 2011
    Last edited by a moderator: Jan 27, 2011
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