It depends on what gun you are trying to put together.
You will probably want to put together a CQBR. It has as LMT upper and a regular M4A1 lower. Don't bother with that one you posted.
Also the good thing about the CQBR is that it has a Back up iron sight, so if your aimpoint goes down, you still have your irons. CQBRs work with both aimpoints and ACOGs. Although the aimpoint with a Wilcox mount is the popular route.
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