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Rock River Arms
Rock River Arms Completed Pistol Upper Receiver, A4 .223/5.56mm, 20 Inch Barrel, Standart Profile, 1-9 Twist, 1/2-28 Thread, A2 Handguard, A2 Flash Hider w/Gas Block, Black, AR0450B
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Aero Precision
Aero Precision Complete Upper Receiver, M4E1, 16in, 5.56 Mid Pencil Barrel, EQ-12 HG Gen 2, FDE Cerakote, APAR640232Q39
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Rock River Arms
Rock River Arms Completed Upper Receiver, Left Handed RAGE 2G .223/5.56mm, 16 Inch Barrel, 1/2-28 Thread, A2 Flash Hider, Black, LH0475
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Aero Precision
Aero Precision EPC-9 Enhanced Complete Upper Receiver, 11in 9mm, EM-9.3in Handguard, Anodized Black, APAR620275M86
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Aero Precision
Aero Precision M4E1 Threaded No Forward Assist Complete Upper Receiver, 10.5in 5.56 Carbine, RM9.2, FDE, APAR712712M2
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Aero Precision
Aero Precision M4E1-T Complete Upper Receiver, .223 Wylde, 16in, Mid Length, S-One M-LOK Handguard, QPQ, Black, APAR712105M88
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