Block 2 upper. Salty FN upper receiver, Colt SOCOM barrel 14.5 pinned and welded with surefire 3 prong flash hider. Brownells gas block. DD RIS II M4A1 rail. Most of the parts were bought from Thoroughbred Armament.
May consider trades, would trade for Eotech Exps 3-0, or an Aimpoint.