GC_UPC Aero Precision AR15 Complete Upper Receiver, 16in 5.56 Carbine Barrel w/ Pinned Front Sight Base, M4 Handguard, Black, APAR505621 $312.79 APAR505621 show more like this Dvor GC_UPC Aero Precision AR15 Complete Upper Receiver, 16in 5.56 Carbine Barrel w/ Pinned Front Sight Base, M4 Handguard, Black, APAR505621 $312.79 APAR505621 show more like this Free Shipping on most orders over $49 Optics Planet GC_UPC Aero Precision Ar-15 Assembled Upper Receiver 16" 5.56mm Carbine Length - Ar-15 Assembled Upper Receiver 16 Carbine Length W/ Fsb $349.99 APAR505621 show more like this additional Brownells