Here's one of mine.
I just got this one about a month ago....custom barrel from Ballistic Advantage here in Florida - Everything else is Spike's.
And here is my pride and joy....my very first complete build. RRA NM Upper/Lower set, DD barrel and BCG and a whole lot of other goodies!
Both of these are on the same lower. The different buttstocks are simply to avoid unslinging. I've since changed the stock on the lower to a Magpul ACS-L. The 20" upper will now be shot with the Magpul MOE instead of the M4 pattern until I get a complete lower for it.