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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
Upper Receiver$310
Bear Creek Arsenal
Bear Creek Arsenal BC-15 .300AAC 16in Right Side Upper Receiver, Heavy, Pistol, 1-8, 5/8x24, Flash Hider, Parkerized, FDE, UASCC5028300PHB161815FDESR
Upper Receiver$310
Grid Defense
Grid Defense Complete Upper Receiver, 7.62x39, 10.5 inch, Carbine Length, 4150 Steel Light HBAR Barrel, 1-10 Twist, A2 Flash Hider, Blue Titanium, GD105E9GFR762BT
Upper Receiver$310
Bear Creek Arsenal
Bear Creek Arsenal BC-15 5.56 NATO 16in Upper Receiver, M4 Barrel, Carbine Length, 1-7 Twist, 1/2x28, Flash Hider, Parkerized, UAFC-4017-556CM41617-15TNGSR
Upper Receiver$310
Ghost Firearms
Ghost Firearms Elite Complete Upper Receiver, 7.62x39, 16in, Carbine Length, 4150 Light HBAR Barrel, 1-10 Twist, 14in M-LOK Free Float Hand Guard, A2 Flash Hider, Flat Dark Earth, GF16E14GFR762FDE
Upper Receiver$310
Grid Defense
Grid Defense Complete Upper Receiver, 9mm 9x19 Para, 5.5 inch, 4150 Light HBAR Barrel, 1-10 Twist, 7 inch Octagon M-LOK Rail, Dimpled Flash Can, Flat Dark Earth, GD55GDR9FCAN9MMFDE
Upper Receiver$310