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Ghost Firearms
Ghost Firearms Upper Receiver, Pistol Lower Parts Kit, 5.56mm/.223, 10.5in, Carbine , Moly Barrel, 1-7 Twist, 9in M-LOK Free Float Hand Guard, A2 Flash Hider, Blue Titanium, GF105E9GFR556BT-KIT
Upper Receiver$450
Rock River Arms
Rock River Arms Completed Upper Receiver, Mid-Length A4 9MM Luger, 16 Inch Barrel, 1-10 Twist, 1/2-36 Thread, A2 Flash Hider, Black, 9MM0388B
Upper Receiver$450
Aero Precision
Aero Precision M4E1 Threaded No Forward Assist Complete Upper Receiver, 10.5in 5.56 Carbine, RM9.2, Anodized Black, APAR712702M2
Upper Receiver$450
Ghost Firearms
Ghost Firearms Upper Receiver, Pistol Lower Parts Kit, .300 Blackout, 10.5in Pistol , Steel Barrel, 1-8 Twist, 9in M-LOK Free Float Hand Guard, A2 Flash Hider, Blue Titanium, GF105E9GFR300BT-KIT
Upper Receiver$450
Aero Precision
Aero Precision Complete Upper Receiver, M4E1, 16in, 5.56 Mid Pencil Barrel, EM-15 HG Gen 2, Anodized Black, APAR640251M39
Upper Receiver$450
Ghost Firearms
Ghost Firearms Upper Receiver, Pistol Lower Parts Kit, 5.56mm, 7.5in, Pistol , 4150 Chrome Moly Steel Barrel, 1-7 Twist, 7in M-LOK Free Float Hand Guard, A2 Flash Hider, FDE, GF75E7GFR556FDE-KIT
Upper Receiver$450