GC_UPC Aero Precision M4E1 Enhanced 14.5" 5.56 Mid-Length Complete Upper Receiver with 12" Enhanced Gen 2 M-LOK Handguard - Anodized Black - APAR640231M5 $574.99 APAR640231M5 show more like this Calculated in Cart Classic Firearms GC_UPC Aero Precision M4E1 Complete Upper Receiver 5.56 Mid Barrel EM-12 HG, No BCG/Charging Handle, Anodized Black, 14.5in, APAR600231M5 $574.99 APAR640231M5 show more like this Dvor GC_UPC Aero Precision M4E1 Complete Upper Receiver 5.56 Mid Barrel EM-12 HG, No BCG/Charging Handle, Anodized Black, 14.5in, APAR600231M5 $574.99 APAR640231M5 show more like this Free Shipping on most orders over $49 Optics Planet