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To back up Kirstang:
If you purchase a good combat optic with a quick release lever it is a matter of seconds to get your 'broken' optic off and your BUIS up.
If you have a 1 power like an eotech or aimpoint (Kirstang's diagram) you typically do not have to even remove the optic because if it stops working all you have to do is flip up your BUIS and then use your iron sights. If the glass breaks then you just remove that sight as I mentioned above.
If you don't want to get really complicated, I would recommend a fixed front sight with a folding rear and then some sort of quality optic. I always leave my front sight up because I can just look past it when using an optic (magnified or 1x) but it provides a much faster reference if my optic craps out and I just have to flip up my rear sight to get back in business.
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"Socialism is a philosophy of failure, the creed of ignorance, and the gospel of envy, its inherent virtue is the equal sharing of misery." - Winston Churchill
"All men dream: but not equally. Those who dream by night in the dusty recesses of their minds wake in the day to find that it was vanity: but the dreamers of the day are dangerous men, for they may act out their dream with open eyes, to make it possible." Seven Pillars of Wisdom, T.E. Lawrence
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