Aero Precision M4E1 Threaded Complete Upper Receiver, 5.56 NATO, 14.5 in Barrel, M4 Profile, 1-7 Twist, 1/2X28 Thread, 12 in ATLAS R-ONE M-LOK Handguard, Black, APAR700704M67

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

Aero Precision M4E1 5.56 NATO No Forward Assist Threaded Assembled Upper Receiver, Anodized Black, APAR712201AC

Aero Precision Complete Upper Receiver, M4E1-T, 14.5In, 5.56 Mid Barrel, 12in M-LOK ATLAS S-ONE Handguard, Flat Dark Earth, APAR700314M5

Aero Precision M4E1 Complete Upper Receiver 5.56 Mid Barrel EM-12 HG, No BCG/Charging Handle, Anodized Black, 14.5In, APAR600231M5

Aero Precision Complete Upper Receiver, M4E1-T, .300, 16In, Blackout Barrel, 12in M-LOK ATLAS S-ONE Handguard, Flat Dark Earth Cerakote, Anodized Black, APAR700314M14

Aero Precision M4E1 Threaded Complete Upper Receiver, 5.56, 11.5In, Carbine Length, 1-7 Twist, 10.3in ATLAS S-ONE Handguard, A2 Flash Hider, Cerakote, OD Green, APAR700389M29

Aero Precision M4E1 Enhanced No Forward Assist Complete Upper Receiver, 16in 5.56 Mid, EM15, FDE, APAR612294M7

Aero Precision M4E1 Enhanced Assembled Upper Receiver, FDE, APAR600202AC

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 5.56 NATO No Forward Assist Threaded Assembled Upper Receiver, FDE Cerakote, APAR712202AC

Aero Precision M4E1-E Complete Upper, 14.5in 5.56 M4 Carbine Barrel, EM-12 Handguard Gen 2 Cerakote, Flat Dark Earth, APAR640232M32

Aero Precision M4E1-T PRO CHF, M4, 5.56Mm, 14.5 Inch Complete Upper Receiver, Hanson, Mid Length, 1-7 Twist, A2 Birdcage, Anodized, Kodiak Brown, APAR700022D115

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 M4E1-T RM10.3 Complete Upper, 5.56 X 45, 12.5Inch, Government, Carbine, 1-7 Twist, 1/2 X 28 Thread, Cerakote, FDE, APAR700713M30

Aero Precision M4E1 5.56 Enhanced Upper Receiver, No Forward Assist, Anodized Black, APAR612201AC

Aero Precision M4E1-T SM10.3 5 Complete Upper, 5.56 X 45, 12.5Inch, Government, Carbine, 1-7 Twist, 1/2 X 28 Thread, Cerakote, FDE, APAR700113M30

Aero Precision M4E1 Enhanced Complete Upper Receiver, 5.56 NATO, 14.5 in Barrel, Government Profile, 1-7 Twist, 12 in M-LOK Handguard, Pinned VG6 Epsilon 556SL Brake, Anodized, Black, APAR640232M68

Aero Precision M4E1 Threaded No Forward Assist Complete Upper Receiver, 10.5in 5.56 Carbine, SM9.2, Anodized Black, APAR712102M2

Aero Precision Complete Upper Receiver, M4E1, 16In, 5.56 Mid Pencil Barrel, EM-12 HG Gen 2, Anodized Black, APAR640231M39

Aero Precision M4E1 Threaded .223 Wylde Complete Upper Receiver, 16In, Mid-Length Barrel, 1-8 Twist, A2 Flash Hider, ATLAS R-ONE Handguard, Black Anodized, APAR700705M9

Aero Precision M4E1-T Complete Upper Receiver, 5.56Mm, 12.5In, Carbine Length, S-One M-LOK Handguard, Black, APAR712102M30

Aero Precision M4E1-T RM10.3 Complete Upper, 5.56 X 45, 12.5Inch, Government, Carbine, 1-7 Twist, 1/2 X 28 Thread, Anodized, Black, APAR700703M30

Aero Precision Lower Parts Kit, M4E1, Magpul MOE, Anodized Black, APRH100968

Aero Precision M4E1 Upper Receiver, AR-15, 5.56x45mm NATO, 7 in M-LOK Handguard, No BCG/Charging Handle, Magpul Cerakote, Flat Dark Earth, APAR640212M0

Aero Precision M4E1-T PRO CHF, M4, 5.56Mm, 11.5 Inch Complete Upper Receiver, Hanson, Carbine Length, 1-7 Twist, A2 Birdcage, Anodized, Black, APAR700005D113

Aero Precision Complete Upper, M4E1-T, .350 Legend, 20In, RM16.6 Cerakote, FDE Cerakote, APAR700716M100

Aero Precision M4E1-T PRO CHF, M4, 5.56Mm, 14.5 Inch Complete Upper Receiver, Hanson, Mid Length, 1-7 Twist, A2 Birdcage, Anodized, OD Green, APAR700012D115

Aero Precision M4E1-T PRO CHF, M4, 5.56Mm, 11.5 Inch Complete Upper Receiver, Hanson, Carbine Length, 1-7 Twist, A2 Birdcage, Anodized, OD Green, APAR700015D113

Aero Precision Lower Parts Kit, M4E1, Magpul MOE, Flat Dark Earth, APRH100969

Aero Precision M4E1-T SM15 Complete Upper, 5.56 X 45, 16Inch, HBAR, Mid Length, 1-7 Twist, 1/2 X 28 Thread, Cerakote,, FDE, APAR700115M97

Aero Precision Lower Parts Kit, M4E1, Magpul MOE SL, Flat Dark Earth, APRH100971

Aero Precision M4E1 Enhanced Stripped Upper Receiver, OD Green, APAR600215AC

Aero Precision M4E1-T 5.56X45 13.5 Inch MOD 4 Upper Receiver, Government, Mid Length, 1 in 7 Twist, A2 Bird Cage, Kodiak Brown, APAR700022D5

Aero Precision M4E1-T PRO 5.56X45, 16 in Upper Receiver, Hanson, Mid Length, 1-7 Twist, A2 Birdcage, OD Green, 11D112-1

Aero Precision M4E1-T 5.56X45 13.5 Inch MOD 4 Upper Receiver, Government, Mid Length, 1 in 7 Twist, A2 Bird Cage, OD Green, APAR700012D5