ACOG. It is supposed to take 12 years for the tritium illumination to decrease by half and another 12 for it to decrease to 25% of when new. Even then the sight still works in most conditions with the fiber optic to gather light, and even when it doesn't, the etched reticle is still visible with any ambient light. By that point, the AIMPOINT batteries may or may not work. If they don't, there is no etched reticle to back up operation of the RDS. Finally, if the ACOG is just not usable in desired conditions, I have BUIS.
Odds are, in 12 years of SHTF, I've probably broken my ACOG and found a different solution anyway.
"We must, indeed, all hang together, or assuredly we shall all hang separately." -Benjamin Franklin
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