14.5 pinned and welded BCM (Enhanced MEDIUM Weight*FLUTED*) Upper Receiver Group w/MCMR-13 Handguard, comp mod 1 muzzle device. Comes with Noveske charging handle.
Shot a few hundred rounds through it and it functions perfect. Selling for less because the obvious finish wear. Wear came from stripping a layer of spray paint off of it (still some on the barrel).