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So far I'm torn between the Centurion C4 and the Geissele MkIV. Both are very light and they fit my hands perfectly. I have small hands and when I put rail ladders on the C4 they still are fairly slim. The MKIV of course doesn't have rails, except for the very front of the rail and the very back but it rest perfectly in my hand for the way I grip it.
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I'm a fan of my URX 3 but I'd prefer to get the 3.1 eventually. I went with the URX 3 compromise because for what a front BUIS would cost I could afford the wrench.
I used a milling machine and drill press to make a picatinny clamp to bridge the upper and rail for letting the loctite set and securing the barrel nut.
I modified three short panels to cover the whole smooth area and have a hand stop rail for the bottom but no pics.
The URX feels like the closest thing to a monolithic.
My second best is a 9" new style DDM4 I was able to find on an equipment exchange but I'd prefer a 10 or 12".
https://www.m4carbine.net/attachment...1&d=1381198129
https://www.m4carbine.net/attachment...1&d=1381198240