GC_UPC Aero Precision Complete Upper, M4E1-T, 5.56, 8in, Pistol Barrel, SM7.3 Anodized, Black, APAR700101M102 $509.99 APAR700101M102 show more like this Dvor GC_UPC Aero Precision M4E1 Threaded Complete Upper, 8" 5.56 Barrel, 7.3" M-LOK ATLAS S-ONE Handguard - Anodized Black $509.99 APAR700101M102 show more like this $8.99 Flat Rate Dirty Bird Industries