I have (2) 6.8's. My 2005 Barrett M-468 and my ARP 12.5" SBR. I bought the 12.5 and bolt and mated it to a LaRue Stealth Upper w 7.0 rail and SLR adjustable gas block. It's shot almost exclusively suppressed .My wife has a 16" 6.8 on a LaRue Stealth upper/ LMT lower with a WOA stainless barrel and has taken two deer with it.

12.5" on top, Barrett M-468 middle, wife's on bottom