Finally finished my 6.8 build. Stag upper, Sabre lower, Magpul CTR (mil-spec), Millet DMS-1, YHM Customizable FF (specter length), YHM lo-pro gas block. Not pictured: YHM flip-up rear BUIS, Smith Vortex FH, Harris bi-pod.
A big thanks to a local gunsmith for his help. I just moved and didn't have my vise or a bench to put it on and not only did he remove the barrel nut (all I asked BTW) he went ahead and assembled everything for me while I waited. Cost me a whole $20 and 20 minutes of talking to Kahrman!
In contrast, I had gone up north (Springfield) and the guy wanted $85 and a 3 week wait. In all honesty I think he had plenty to keep him going and didn't need my little job, but I would have appreciated him just saying so.