GC_UPC Aero Precision M4E1 Threaded 5.56mm Complete Upper Receiver, 10,5in, M4 Barrel, 1-7 Twist, A2 Flash Hider, ATLAS R-ONE Handguard, FDE Cerakote, APAR700712M2 $569.99 APAR700712M2 show more like this Dvor