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Rock River Arms
Rock River Arms Completed Upper Receiver, A4 9MM Luger, 10.5 Inch Barrel, 1-10 Twist, 1/2-36 Thread, R4 Handguard, A2 Flash Hider, Black, 9MM0364B
Upper Receiver$480
Aero Precision
Aero Precision Complete Upper Receiver, M4E1, .300 Blackout Barrel EQ-15 HG, No BCG/Charging Handle, Gen 2, FDE Cerakote, 16in, APAR600252Q14
Upper Receiver$480
Aero Precision
Aero Precision M4E1-T Complete Upper Receiver, .223 Wylde, 16in, Mid Length, R-One M-LOK Handguard, QPQ, Black, APAR712705M88
Upper Receiver$480
Aero Precision
Aero Precision Complete Upper Receiver, M4E1, 16in, 5.56 Mid Pencil Barrel, EQ-12 HG Gen 2, FDE Cerakote, APAR640232Q39
Upper Receiver$480
Rock River Arms
Rock River Arms Completed Pistol Upper Receiver, A4 .223/5.56mm, 20 Inch Barrel, Standart Profile, 1-9 Twist, 1/2-28 Thread, A2 Handguard, A2 Flash Hider w/Gas Block, Black, AR0450B
Upper Receiver$480
Aero Precision
Aero Precision M4E1 Threaded No Forward Assist Complete Upper Receiver, 10.5in 5.56 Carbine, RM9.2, FDE, APAR712712M2
Upper Receiver$480