I'm running the exact same set up, 6920, ML3 on a LaRue cant mount, and a Troy battle rear.
Although I have not tried to zero for 25, I had no problem with a 50 yard zero.
Haven't had an Aimpoint come zeroed out of a box yet. They are close, but not right on.
Failure2Stop said;
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.
Yep, what he said..........I find it easier to zero the dot.
You should be 1 1/4"-1 3/8" low at 25 yards for a 50 yard zero.
If it isn't durable, it isn't reliable.
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