I've been meaning to post in this thread for a while, and I finally had my rifle and camera in the same room tonight...
It started life as as a stripped Stag-15 lower receiver. I built out the lower, then put a 16" carbine upper on it, but I wanted something for long-range competition and 3-Gun matches.
So, it currently has a Timney drop-in trigger and a Spike's FailZero M16 bolt/carrier. The new upper was done by Clark Custom Guns. It is a 20" HBAR fluted Krieger barrel, Miculek compensator, carbon-fiber full-length handguard, Harris bipod, EOtech sight, and a Primary Arms 5x magnifier with flip-to-side mount. Oh, and the Magpul BAD lever is just a must-have accessory!