Skunk- yeah all the iron sights are usable on all of the ARs with optics. The bottom A2 has the M68 day optic (Aimpoint Comp M) on the ARMS mount that allows co-witnessing of the dot with the front post.
The top M4 type has a GG&G MAD flip up mounted behind the ELCAN; pop off the ELCAN and you're good to go.
The next M4 type has the ARMS #40 flip up rear sight mounted behind the EOtech 550, the flip up can be used without removing the 550.
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