Using your BUIS and Aimpoint's T2 optic

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Originally Posted by GJM

Me, too. I have noted the POI windage shift between large and small aperture, which was a surprise, but never a T1/2 effect on BUIS zero.

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Some irons do not have an offset machined into their apertures I have found.

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Originally Posted by Unobtanium

Some irons do not have an offset machined into their apertures I have found.

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What does this mean?

Unobtainable, out of curiosity, did you notice this shift with the large aperture, small aperture or both, and what model/brand BUIS?

Wannabe, in the Troy BUIS at least, we notice windage shifts going from large to small aperture. This minute, I am forgetting which way the shift was. We noticed it when my wife was zeroing Troy BUIS on a AAC .300, and she shoots good enough groups to clearly see it at 50 yards. (I just use the small aperture.)

Rosh works sl1 up front and magpul MBUS rear. Small aperture only.

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Originally Posted by Wannabe

What does this mean?

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Many BUIS dual aperture flip on a screw. Screw has threads. The rest is simple math.

I have not tried this with my T2's yet, but with T1's and Comps, I have never seen this kind of shift. I usually zero my irons without my RDS on, and then shoot them through the RDS during training.