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Aero Precision
M4E1 Enhanced No FA Complete Upper 10in .300 BLK
Upper Receiver$300
Bear Creek Arsenal
Bear Creek Arsenal BC-15 5.56 NATO 16in Upper Receiver, M4 Barrel, Carbine Length, 1-8 Twist, 1/2x28, Flash Hider, Parkerized, ODG, UAFC-4036-556CM41618-15ODGSR
Upper Receiver$300
Ghost Firearms
Ghost Firearms Elite Complete Upper Receiver, .300 Blackout, 10.5in, Pistol Length, 4150 Light HBAR Barrel, 1-8 Twist, 9in M-LOK Free Float Hand Guard, A2 Flash Hider, Burnt Bronze, GF105E9GFR300BB
Upper Receiver$300
Ghost Firearms
Ghost Firearms Elite Complete Upper Receiver, 5.56x45 NATO, 7.5 inch, Pistol Length, 4150 M4 Barrel, 1-7 Twist, 7 inch M-LOK Free Float Hand Guard, A2 Flash Hider, OD Green, GF75E7GFR556OD
Upper Receiver$300
Bear Creek Arsenal
Bear Creek Arsenal BC-15 5.56 NATO 16in Upper Receiver, M4, Mid-Length, 1-7, 1/2x28, Flash Hider, Black Nitride, UAFC4000556MM41617M15TNGSR
Upper Receiver$300
FM Products
FM Products Mike-9 9mm Luger 5inch Upper Receiver, 1-10 Twist, 1/2x36 Threads, Type III Hardcoat Anodized, Black, MIKE9U-R54-B
Upper Receiver$300