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Aero Precision M4E1 Threaded Assembled Upper Receiver - No Forward Assist - Anodized Black - APAR712201AC
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Aero Precision M4E1 Threaded Assembled Receiver Set - Anodized Black - APCS100177
Aero Precision M4E1 Threaded Assembled Upper Receiver - OD Green Cerakote - APAR700417AC
Aero Precision AR-15 XL Assembled Upper Receiver - Anodized Black - APAR611310AC
Aero Precision AR15 Assembled Upper Receiver - Anodized Black - APAR501603AC
Bravo Company 4URM4 BCM M4 Upper Assembly Multi-Caliber 7075-T6 Aluminum Black Anodized Receiver for AR-15
Aero Precision EPC-9 - Enhanced Upper Receiver w/ LRBHO - FDE Cerakote - APAR620302AC
Aero Precision Assembled Receiver Multi-Caliber 7075-T6 Aluminum Flat Dark Earth Cerakote Receiver for AR-15 - APAR50180
Anderson Manufacturing AR-15 Complete Upper Receiver - Multi Caliber - B2-K600-A000-0P
Aero Precision - M4E1 Threaded Assembled Upper - No Forward Assist - FDE Cerakote - BLEM - APAR712202BAC
Aero Precision M5E1 Enhanced Upper Receiver - FDE Cerakote - BLEM - APAR308506BAC
Aero Precision EPC-9 - Enhanced Upper Receiver w/ LRBHO - FDE Cerakote - BLEM - APAR620302BAC
Aero Precision M4E1 Threaded Assembled Upper Receiver - ODG Cerakote - BLEM - APAR700417BAC
Aero Precision M4E1 Assembled Threaded Upper Receiver, Special Edition: Thunder Ranch FDE Cerakote - BLEM - APAR700219BA
Aero Precision M4E1 Threaded Assembled Upper Receiver - Sniper Grey Cerakote - BLEM - APAR700272BAC
Aero Precision M5 Assembled Upper Receiver, Ambi Charging Handle & .308 Black Nitride BCG - APSL100447S
Aero Precision M4E1 Threaded Assembled Upper Receiver, BREACH Charging Handle & 5.56 Black Nitride BCG - APSL100446S