I didn't like the standard A2 FSB, and liked the look of a rifle length rail on my 16" middie barrel. I also use a CAA flip up VFG, and did not want to worry about any pressure I was exerting on the grip affecting the accuracy.
This is what it came out like using a YHM free float, and Samson lpgb:
I am very happy with the results, and with a few tools it was easy to install.