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Thread: Zeroing Problem. seriously.

  1. #1
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    Zeroing Problem. seriously.

    Heres the setup.

    6920LE
    LT Cantilever mount
    Aimpoint M3
    LT Troy BUIS
    Ammo: tried both 55gr Federal and 55gr Monarch

    I was trying to Zero my Aimpoint M3 and also my LT Troy BUIS.

    After shooting with just the LT Troy BUIS my shots were shooting low. I'd say 3"+ at 25yrds.
    I said the heck with it I'll strap on my Aimpoint and see what happens. Same result was shooting low.
    After Zeroing the Aimpoint to hit Dead on, this was the result:


    Is there a problem with my Colt shooting low? I know the BUIS is supposed to be at a proper height already because simply you can not adjust height on it. 2nd Aimpoints should already come zeroed. I'm wondering if there is something wrong with the 6920LE to shoot so low. It almost seems maybe the LT Troy BUIS is to short.

  2. #2
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    Did you adjust the front sight post?

  3. #3
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    Quote Originally Posted by Hound_va View Post
    Did you adjust the front sight post?
    No i did not touch the Front sight post. Thinking it was a 6920 i thought it was most likely seated properly in the first place. Also thats a huge adjustment. I mean the dot is practically sitting in the middle of the front sight post. I doubt it will let you screw it in that deep into the FSB. Maybe the Cantilever mount could of been manufactured to high? I am trying to go for a 1/3 cowitness.

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  5. #5
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    Quote Originally Posted by Hound_va View Post

    I am using a LT Troy BUIS. It has no elevation adjustments.

  6. #6
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    You may want to read thru it to understand the relationship with the front sight post. You need to make an adjustment to it in order to zero at 25 yards.

  7. #7
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    Quote Originally Posted by Hound_va View Post
    You may want to read thru it to understand the relationship with the front sight post. You need to make an adjustment to it in order to zero at 25 yards.
    That site talks about bringing down your POA. But I need to bring up my POA. I'm shooting to low. with BUIS. I don't believe I can screw my Front sight post into the FSB that low to zero it.

  8. #8
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    Try it, you'll likely be surprised. You did read #7 correct? You have no other parts on the rifle that give you elevation adjustment. Just the front sight post, which must be adjusted in order for you to zero your irons at 25 yds.

  9. #9
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    Quote Originally Posted by Hound_va View Post
    Try it, you'll likely be surprised. You did read #7 correct? You have no other parts on the rifle that give you elevation adjustment. Just the front sight post, which must be adjusted in order for you to zero your irons at 25 yds.


    I don't think its normal for FS post to sit so low inside the FSB. Any other ideas?

  10. #10
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    Generally a 25 yd zero is recommended against. POA/POI at 25 is very limited in use- the organizations that use a 25 yds zero are generally using the rear sight set at 6/3 +2 (for M4s IIRC) which they dial back down to 6/3 once zeroed. This is not applicable for you since you are using the Troy rear.

    I only use 25 yds for initial correction and then move onto 50 yards or 200 yards, depending on range constrictions.
    At 25 yds POI should be roughly 1" below POA.
    Once that is achieved you will be ready for 50 or 200 yd refinement.

    I generally prefer to zero the irons first with the dot turned off. Then adjust the dot so it sits at the tip of the front sight and confirm by shooting with the dot centered in the optic.

    Just my .02
    Jack Leuba
    Director, Military and Government Sales
    Knight's Armament Company
    jleuba@knightarmco.com

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