Quoted: Best I have seen yet is the SIR(I think thats what its called)system and quick release mounts on your optics. You can quickly remove the optics and use the flip up sites.
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Depending on the model, he may not have anything to flip up.
Mine came equipped with a normal front sight, and the rear is RRA's "tactical carrying handle", which is basically a rail with a rear sight built in that mounts on the rail of the RRA flattop receiver.
Net result is iron sights, and the ability to mount optical sights ABOVE the rear sight.
If anybody has a reasonably priced mount and low power scope (2.5X max) or red dot sight that positions the sight so you can see the RRA sights through it, I'd sure like to hear about it too.
For those that want to look at a picture, last I knew RRA's website had a pic of this arrangement on the Uppers page, or see the CAR15 Tactical Elite PostBan.