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M4E1 Threaded Complete Upper 18″ 6.5 Grendel SS Barrel ATLAS R-ONE 15″ M-LOK HG – Anodized
Aero Precision M4E1 Threaded No FA Complete Upper 10.5″ 5.56 Carbine 9.2″ M-LOK ATLAS S-ONE – Anodized Black
Aero Precision M5 Complete Upper 22″ 6.5 CM SS Fluted BRL ATLAS S-ONE 15″ M-LOK HG – Black
