It is a M4Gray,
GG&G Dominator FF, GG&G floding front and rear sights, LMT A3 upper, 16in mp/sp 1/7 cl barrel, propper M4 feed ramps, phathom flash hider,
LMT M16 standard BCG, Moe Grip, CRT Stock mil spec, h-buffer, Cs tac spring, RGuns lower w/ contoured mag well, DPMS guts, BCM/Valtor Mod3 charging handle, E1E in a scope ring and a custome 3pt sling made by me.