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Rock River Arms
Rock River Arms Completed Pistol Upper Receiver, A4 .223/5.56mm, 16 Inch Barrel, Mid-Length Profile, 1-9 Twist, 1/2-28 Thread, A2 Flash Hider w/Gas Block, Black, AR0388B
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 Complete Upper Receiver, M4E1, .300 Blackout Barrel EQ-15 HG, No BCG/Charging Handle, Gen 2, FDE Cerakote, 16in, APAR600252Q14
Upper Receiver$480
Lead & Steel
Lead & Steel JAG 5.56mm 16in Upper Receiver Group, Mid Length, 1-7 Twist, Flash Hider, Earth, 120723
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
Aero Precision
Aero Precision EPC-9 Enhanced Complete Upper Receiver, 11in 9mm, EM-9.3in Handguard, Anodized Black, APAR620275M86
Upper Receiver$480