Aero Precision M4E1 Threaded .300 Blackout Complete Upper Receiver, 16In, 1-7 Twist, A2 Flash Hider, 5/8X24 Thread, ATLAS R-ONE Handguard, Black Anodized, APAR700705M14

Aero Precision M4E1 Threaded .300 Blackout Complete Upper Receiver, 10In, 1-7 Twist, 5/8X24 Thread, ATLAS R-ONE Handguard, Black Anodized, APAR700702M4

Aero Precision M4E1 Assembled Upper Receiver, Thread, M-LOK Handguard, Anodized, OD Green, APAR700220AC

Aero Precision M4E1 Threaded .223 Wylde W/ ATLAS R-ONE Handguard Complete Upper Receiver, 18 Inch Barrel, 1-8 Twist, A2 Flash Hider, Magpul Cerakote, Flat Dark Earth, APAR700716M76

Aero Precision M4E1 Threaded 5.56mm Complete Upper Receiver, 14,5In, Mid-Length Barrel, 1-7 Twist, 1/2X28 Thread, ATLAS R-ONE Handguard, FDE Cerakote, APAR700714M5

Aero Precision M4E1 Threaded 5.56mm Complete Upper Receiver, 10,5In, M4 Barrel, 1-7 Twist, A2 Flash Hider, ATLAS R-ONE Handguard, Black Anodized, APAR700702M2

Aero Precision M4E1 Threaded 5.56mm Complete Upper Receiver, 14,5In, Mid-Length Barrel, 1-7 Twist, 1/2X28 Thread, ATLAS R-ONE Handguard, Black Anodized, APAR700704M5

Aero Precision M4E1 Threaded .223 Wylde Complete Upper Receiver, 18In, Fluted Barrel, 1-8 Twist, A2 Flash Hider, ATLAS R-ONE Handguard, Black Anodized, APAR700705M51

Aero Precision M4E1 Assembled Upper Receiver, Thread, M-LOK Handguard, Anodized, Brown, APAR700222AC

Aero Precision M4E1 Enhanced No Forward Assist Complete Upper Receiver, 16in 5.56 Mid, EM15, Anodized Black, APAR612218M7

Aero Precision Complete Upper Receiver, M4E1-T, .223 Wylde, 18In, Government, Rifle Length, 1 in 8, 1/2 X 28, 15In, A2 Flash Hider, Cerakote, FDE, APAR700715M42

Aero Precision M4E1 Threaded .300 Blackout Complete Upper Receiver, 8In, 1-7 Twist, 5/8X24 Thread, ATLAS R-ONE Handguard, FDE Cerakote, APAR700711M1

Aero Precision M4E1 Threaded 5.56mm Complete Upper Receiver, 10,5In, M4 Barrel, 1-7 Twist, A2 Flash Hider, ATLAS R-ONE Handguard, FDE Cerakote, APAR700712M2

Aero Precision M4E1 Threaded 5.56mm Complete Upper Receiver, 18In, 1-7 Twist, A2 Flash Hider, ATLAS R-ONE Handguard, Black Anodized, APAR700705M8

Aero Precision M4E1 Threaded 5.56mm Complete Upper Receiver, 20In, 1-7 Twist, A2 Flash Hider, ATLAS R-ONE Handguard, Black Anodized, APAR700705M48

Aero Precision Complete Upper Receiver, M4E1-T, 5.56x45mm NATO, 11.5In, Government, Carbine Length, 1 in 7, 1/2 X 28, 10.3In, A2 Flash Hider, Anodized, OD Green, APAR700396M29

Aero Precision Complete Upper Receiver, M4E1-T, RM-15, 5.56x45mm NATO, 16In, Government, Mid Length, 1 in 7, 1/2 X 28, 15In, A2 Flash Hider, Anodized, Kodiak Brown, APAR700401M7

Aero Precision Complete Upper Receiver, M4E1-T, 5.56x45mm NATO, 16In, Government, Carbine Length, 1 in 7, 1/2 X 28, 12.7In, A2 Flash Hider, Anodized, Black, APAR700704M6

Aero Precision Complete Upper Receiver, M4E1, .300 Blackout Barrel EM-12 HG, No BCG/Charging Handle, Gen 2, Anodized Black, 16In, APAR600231M14

Aero Precision Complete Upper Receiver, M4E1-T, RM12.7, 5.56x45mm NATO, 13.9In, Government, Mid Length, 1 in 7, 1/2 X 28, 12.7In, A2 Flash Hider, Cerakote, FDE, APAR700714M99

Aero Precision Complete Upper Receiver, M4E1-T, SM12.7, 5.56x45mm NATO, 13.9In, Government, Mid Length, 1 in 7, 1/2 X 28, 12.7In, A2 Flash Hider, Cerakote, FDE, APAR700114M99

Aero Precision Complete Upper Receiver, M4E1-T, RM-15, 5.56x45mm NATO, 16In, Government, Mid Length, 1 in 7, 1/2 X 28, 15In, A2 Flash Hider, Anodized, OD Green, APAR700178M7

Aero Precision M4E1 5.56 NATO No Forward Assist Threaded Assembled Upper Receiver, Kodiak Brown, APAR712204AC

Aero Precision Complete Upper Receiver, M4E1-T, SM-15, 5.56x45mm NATO, 16In, Government, Mid Length, 1 in 7, 1/2 X 28, 15In, A2 Flash Hider, Anodized, OD Green, APAR700179M7