I am in the process of free floating one of my carbine uppers. Right now I am running a Midwest Industries carbine rail (I am very happy with it, by the way) but I want/need some more rail space. So, I figured I might as well free-float it also. I don't really know much about low-profile gas blocks. Do I want aluminum or steel? Do I want the set screws or the clamp-on style? I was thinking of using a VLTOR or a JP. Those any good? Thanks, guys

