Mine or Rob's, Brother Mike? I'm running a .30 Cal Spike's DynaComp on the end of mine.
My whole topend will be PRI parts, and the only one in that picture so far is the flip-up front sight. I still need the free float rail, upper rail, rear sight, BCG, Gunfighter charging handle, Leopold 1-4 scope and Warne rings for it. I'm well over a grand away from finishing that thing... Well over... :-[