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Bear Creek Arsenal
Bear Creek Arsenal BC-15 6mm ARC 16in Bolt Action Style Upper Receiver, M4 Barrel, 1-8 Twist, 5/8x24, Flash Hider, Parkerized, UABA-371-6MMAMM41618-15ASR
Upper Receiver$310
Bear Creek Arsenal
Bear Creek Arsenal BC15 5.56 NATO 16in Right Upper Receiver, M4, Carbine, 1-8, 1/2x28, Flash Hide, Nitride, Tungsten, UASCC5047556CM41618MHF15TNGSR
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Ghost Firearms
Ghost Firearms Elite Complete Upper Receiver, 9mm 9x19 Para, 16 inch, 4150 Light HBAR Barrel, 1-10 Twist, 14 inch M-LOK Free Float Hand Guard, A2 Flash Hider, OD Green, GF16E14GFR9MMOD
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Grid Defense
Grid Defense Complete Upper Receiver, 5.56mm, 10.5 inch, Carbine Length, 4150 Steel M4 Barrel, 1-7 Twist, A2 Flash Hider, Tungsten Gray, GD105E9GFR556TG
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Bear Creek Arsenal
Bear Creek Arsenal BC-15 5.56 NATO 16in Bolt Action Style Upper Receiver, Bear Claw Fluted Heavy, 1-8, 1/2x28, Flash Hider, Black Nitride, UABA396556CHB1618SSBCF15ASR
Upper Receiver$310
Grid Defense
Grid Defense Complete Upper Receiver, 5.56mm, 10.5 inch, Carbine Length, 4150 Steel M4 Barrel, 1-7 Twist, A2 Flash Hider, Tactical Grape, GD105E9GFR556GRP
Upper Receiver$310