Andro Corp 5.56 NATO 10.5" Barreled Upper Receiver

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Radical Firearms 16" 5.56 NATO 1:7 Mid-Length SOCOM Barreled Upper - 12" M-LOK FCR Rail - Open Box

BATTLE ARMS Authority ELite Upper Recv 5.56 10.5" AR-15 Gray

Aero Precision M4E1 Threaded Barreled AR-15 Upper 5.56 Carbine Length ATLAS R-One - 16"

AERO PRECISION M4E1-T 5.56 NATO 11.5" Complete Upper Receiver | Black

BUSHMASTER QRC Upper 5.56 NATO 16" - Black