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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
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Bear Creek Arsenal
Bear Creek Arsenal BC-15 5.56 NATO 16in Right Side Upper Receiver, M4, Carbine, 1-8, 1/2x28, Flash Hider, Parkerized, FDE, UASCC5037556CM4161815FDESR
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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, FDE, UAFC-4037-556CM41618-15FDESR
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Bear Creek Arsenal
Bear Creek Arsenal BC-15 5.56 NATO 16in Right Side Upper Receiver, M4, Mid-Length, 1-7, 1/2x28, Flash Hider, Parkerized, FDE, UASCC5019556MM4161715FDESR
Upper Receiver$300