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Aero Precision - M4E1 Threaded Complete Upper - Semi-auto - 16" SS Barrel - .223 Wylde - Anodized Black - APAR70030
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Aero Precision M4E1 Threaded 12.5" 5.56 Carbine Length Complete Upper Receiver w/ ATLAS S-ONE Handguard - APAR70030
Aero Precision EPC-9 Threaded Upper Receiver w/ LRBHO Anodized Black - APAR620201AC
Aero Precision M4E1 Threaded 12.5" 5.56 Carbine Length Complete Upper Receiver w/ ATLAS S-ONE Handguard - Cerakote
Brigade Manufacturing Upper Receiver - 9" Barrel - 9mm - Armor Black Cerakote - Mini Can Flash Hider - 8" U-Lo
Aero Precision EPC-9 Enhanced 8.3" 9mm Complete Upper Receiver with Enhanced 7.3" Handguard - FDE Cerakote - A