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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
Rock River Arms
Rock River Arms Completed Pistol Upper Receiver, A4 .223/5.56mm, 7 Inch Barrel, 1-9 Twist, 1/2-28 Thread, Free-Float Handguard, A2 Flash Hide, Black, AR0365B
Upper Receiver$450
Lead & Steel
Lead & Steel Just As Good Upper Receiver Group, 16in Barrel, 1-7 Twist, Charcoal, JAG-16-URG-GRY
Upper Receiver$450
Ghost Firearms
Ghost Firearms Upper Receiver, Pistol Lower Parts Kit, .300 Blackout, 10.5in Pistol, Moly Steel Barrel, 1-8 Twist, 9in M-LOK Free Float Hand Guard, A2 Flash Hider, Tac Grape, GF105E9GFR300GRP-KIT
Upper Receiver$450
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, OD Green, GF105E9GFR556OD-KIT
Upper Receiver$450
Aero Precision
Aero Precision M4E1 Threaded No Forward Assist Complete Upper Receiver, 10.5in 5.56 Carbine, SM9.2, Anodized Black, APAR712102M2
Upper Receiver$450