Originally Posted by
jmart
Recommend you zero at 50.
First, zero the Aimpoint. Don't worry about where the irons are.
next, zero the irons. Make windage adjustments using the windage on the rear BUIS, make elevation adjustments using the front sight post.
The LT mount should allow 1/3 cowitness. When you are done you should find that with a normal cheekweld, the Aimpoint dot is centered in the glass and the irons are well below the dot, in the lower third of the glass. To use the irons at this point you'll need to adjust your cheekweld. When you do you ought to see the dot right on top of the FSP, but it will still be in the lower third of the glass.