GC_UPC Aero Precision Complete Upper Receiver, M4E1 Threaded PRO, 5.56, 16.3in Barrel, Gov Profile, Mid-Length Gas System, 1-7 Twist, 1/2 x 28 Thread, ATLAS R-ONE Handguard, VG6 Delta Flash Hider, Anodized, Black, APUG700705M105-1 $839.99 APUG700705M1051 show more like this Free Shipping on most orders over $49 Optics Planet GC_UPC Aero Precision AR-15 M4E1 PRO Upper Receiver Assembly 5.56x45mm NATO Cold Hammer Forged Barrel ATLAS R-ONE M-LOK Handguard - 135943 $864.99 APUG700705M105-1 show more like this 14.25 MidwayUSA GC_UPC Aero Precision M4E1 Threaded PRO Complete Upper with 16.3" 5.56 CHF Mid-Length Barrel and 15" ATLAS R-ONE Handguard - Anodized Black - APUG700705M105-1 $1,029.99 APUG700705M105-1 show more like this Calculated in Cart Classic Firearms