interesting, thanks for posting.
i wrote this in 2012 on another board.
granted, i'm not in the military, so I don't claim to know what they need, but ime, the first reason is just risk. the second reason is the bigger issue. when you get to the point that magnification is worth the extra size, weight and speed compared to a 1x aimpoint, then backups aren't really backups, are they? in the author's example, can you hit a 6" or 8" plate from 200-300 yards with your buis? i sure can't. i could get lucky at 200, but holdover at 300 will obscure that target behind the front sight.i dropped BUIS and iron sights long ago. i don't put them on any of my new guns. i don't train with the ones that are fixed to my old guns.
two reasons:
1. none of my aimpoints or acogs (or swaro z6i) have ever let me down. not even once. never not been zeroed. never had a dead battery. i train to transition to a pistol if i need it, so that's what i would do instead of deploying a BUIS.
2. BUIS don't meet my needs. If i didn't have an optic, the iron sight wouldn't allow me to see the targets i shoot at the distance i'm shooting them.
so if the risk calculation says you need a backup, the only viable option i know of is a QD lever and a second pre-zeroed optic stashed in your pack somewhere.
just a thought...


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