HI GB:
Yeah I also am a fan of Eotech and Aimpoint. But you are correct the price is a killer for the Aimpoint.
I put the Eotech 512 on this one, even though it is not in the picture. They are great for quick acquisition and co-witness with the BUIS.
I have different setups on my personal AR's and some seem to fit and work better than others. My RRA LAR15 sports a CAA five way forearm grip. The forearm grip just seems to fit natural when I grab it. MFT also makes a foeram grip that attaches to the forearm to a lower picatinny rail with a built in flashlight holder. When you grab the grip there is a button at the top of the grip to turn the light on and off. I also really like the 3X Burris 332 Tactical Scope. That is a pretty good bang for the buck. The reticule reminds me of an Acog.
Yep, you can trick out these AR's seven ways to Sunday. All it takes is money.... LOL
Regards PAH04