Have for sale one Genuine Colt M4A3 Upper. Upper receiver is black with small front pivot, C AF mark on side of receiver, M4 mark above gas tube opening and feed ramp cuts. Barrel is marked CMP 5.56 NATO 1/7, has step cut and is marked with a 4 on the end of the barrel extension. Includes carry handle with 6/3 elevation, black charging handle, slide sling swivel, bayonet lug, M4 lined handguards and A2 flashhider. Bolt carrier assembly is not included. Upper has 20 rounds through it and has been sitting in my safe for the past several years. I have 3 other Colt AR's and have started shooting more pistol than rifle the last couple of years and the safe is getting a little crowded. Price is $725 plus $15 shipping. USPS money order only. Can send pictures on request.