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Aero Precision M4E1 Threaded 14.5" 5.56 Mid-Length Complete Upper Receiver w/ ATLAS R-ONE Handguard - Anodized Blac
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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 M4E1 Threaded 12.5" 5.56 Carbine Length Complete Upper Receiver w/ ATLAS S-ONE Handguard - Cerakote
Aero Precision M4E1 Threaded 12.5" 5.56 Carbine Length Complete Upper Receiver w/ ATLAS R-ONE Handguard - Cerakote
Aero Precision M4E1 Threaded 12.5" 5.56 Carbine Length Complete Upper Receiver w/ ATLAS R-ONE Handguard - Anodized
Aero Precision M4E1 Enhanced 8" .300 Blackout Complete Upper Receiver - Anodized Black - APAR640211M1
Aero Precision M4E1 Threaded 8" .300 Blackout Complete Upper Receiver w/ ATLAS R-ONE Handguard - Cerakote FDE - APA