GC_UPC Aero Precision M4E1 Enhanced Upper Receiver Assembled AR-15 Aluminum - 999061 $157.49 APAR600201AC show more like this 9.50 MidwayUSA GC_UPC AR-15 M4E1 ENHANCED UPPER RECEIVER MAP - show more like this Huligan Arms GC_UPC Aero Precision Apar600201ac M4e1 Enhanced Receiver 5.56X45mm Nato 7075-T6 Aluminum Black Anodized Receiver For Ar-15 $180.13 APAR600201AC show more like this Firearms $18.45, Free over $500 Shooting Surplus GC_UPC Aero Precision Ar-15 M4e1 Enhanced Upper Receiver - M4e1 Enhanced Upper Receiver $199.99 APAR600201AC show more like this additional Brownells GC_UPC AERO PRECISION AR15 M4E1 Enhanced Upper Receiver - Anodized Black $199.99 APAR600201AC show more like this Most Firearms ship for FREE KyGunCo GC_UPC Aero Precision M4E1 AR-15 Upper Receiver 5.56/.223, Black $199.99 APAR600201AC show more like this $8.99 Impact Guns GC_UPC Aero Precision APAR600201AC M4E1 Enhanced Receiver 5.56x45mm NATO 7075-T6 Aluminum Black Anodized Receiver for AR-15 $199.99 APAR600201AC show more like this $10.95 flat rate GunStuff TV GC_UPC Aero Precision APAR600201AC M4E1 Enhanced Receiver 5.56x45mm NATO 7075-T6 Aluminum Black Anodized Receiver for AR-15 $199.99 APAR600201AC show more like this 8.95 Beebe Family Arms & Munitions