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Thread: MOA value of LaRue BUIS

  1. #1
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    MOA value of LaRue BUIS

    I've searched and did not find.

    Does anyone know what is the MOA/windage click value of a LaRue BUIS? I got mine today and need to hit the range tomorrow or Friday to zero it up.

    BTW, I just keep being impressed by LaRue products and service.

    When I bought my M68 CCO mount that's all I got. But today they more than made up for it with a LaRue hat, 'dillo, and little vial of machine gunner's lube!

  2. #2
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    What length gas system? Are you using a regular front sight tower, or a flip up front sight?

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    Quote Originally Posted by UVvis View Post
    What length gas system? Are you using a regular front sight tower, or a flip up front sight?
    Thanks for trying to help but none of those factors are relevant to the question as they do not affect the distance that point of impact is moved by each windage click.

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    Quote Originally Posted by Alpha Sierra View Post
    Thanks for trying to help butnone of those factors are relevant to the question as they do not affect the distance that point of impact is moved by each windage click.

    I'm pretty sure gas system length does if the windage screw is the same pitch between rifle and carbine length. On the carbine length system it would move it a greater angular distance. Or for example, if one click moves the sight .005" laterally, that .005" movement will result in a greater angular displacement on the shorter sight radius.

    I'm thinking it's between 1/2 and 1 MOA per click, IIRC.

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    Quote Originally Posted by jmart View Post
    I'm pretty sure gas system length does if the windage screw is the same pitch between rifle and carbine length. On the carbine length system it would move it a greater angular distance. Or for example, if one click moves the sight .005" laterally, that .005" movement will result in a greater angular displacement on the shorter sight radius.

    I'm thinking it's between 1/2 and 1 MOA per click, IIRC.

    It's actually sight radius, not gas system length that affects the exact click value. And the type of FSB matters not at all.

    In any case, the change in actual click value due to the difference in sight radius between a rifle an carbine is not going to amount to 1/10 MOA.

    I just need to know the nominal click value in MOA for a LaRue BUIS.

  6. #6
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    Like I say, it's somewhere between 1/2 and 1 MOA. I know if you have a good iron zero you can get a red dot pretty close by adjusting the dort to line up with your irons, maybe you could do the reverse.

    If you have an optic, zero it first. Then install the BUIS and align the windage to line up on the same vertical plane. As long as your cheekweld is good and you've got the dot centered I would think you ought to be close. I can't say for sure though, I got my BUIS before my EoTech so I adjusted the EoTech to line up with irons.

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    Thanks jmart.

    My Aimpoint is already zeroed. The BUIS is new to replace a MI flipper that fell apart. I'll just walk the rounds in at 50 yards. I suspect that if LaRue uses a GI windage leadscrew it will be a nominal 1/2 MOA.

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    Not to be a smartass but why don't you shoot a group at 100 yds, move it a click or two, measure, then determine what the click value is. Let us know. I'm curious myself.

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    Quote Originally Posted by Nick S View Post
    Not to be a smartass but why don't you shoot a group at 100 yds, move it a click or two, measure, then determine what the click value is. Let us know. I'm curious myself.
    Not a smartass at all.

    I plan on doing just that but at 50 yards to make sure I'm on paper somewhere.

    The reason I ask is because all adjustable sights (like scopes) have a designed nominal MOA/click value and knowing that makes for a more efficient zeroing process.

  10. #10
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    Why don't you call LT and ask them what the click value is on their product?

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