F Aero Precision M4E1 Threaded 5.56mm Complete Upper Receiver, 14,5in, Mid-Length Barrel, 1-7 Twist, 1/2x28 Thread, ATLAS R-ONE Handguard, w/VG6 Precision Gamma 556 SL, Black Anodized, APAR700704M5V38 $654.99 APAR700704M5V38 show more like this Dvor F Aero Precision M4E1 Threaded Complete Upper, 14.5" 5.56 Mid-Length Barrel with Pinned Gamma 556 SL, 12" M-LOK ATLAS R-ONE Handguard - Anodized Black - APAR700704M5V38 $654.99 APAR700704M5V38 show more like this Calculated in Cart Classic Firearms F Aero Precision M4E1 Threaded 5.56mm Complete Upper Receiver, 14,5in, Mid-Length Barrel, 1-7 Twist, 1/2x28 Thread, ATLAS R-ONE Handguard, w/VG6 Precision Gamma 556 SL, Black Anodized, APAR700704M5V38 $654.99 APAR700704M5V38 show more like this Free Shipping on most orders over $49 Optics Planet F Aero Precision M4E1 5.56 14.5" Complete Upper w/ Pinned VG6 Gamma 556SL $654.99 APAR700704M5V38 show more like this $8.99 Flat Rate Dirty Bird Industries