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Aero Precision M4E1 Threaded Barreled Upper 5.56 Carbine Atlas R-One - 12.5"
Aero Precision M5 12.5" Barreled .308 Upper Receiver with Atlas R-ONE Rail - Black
Aero Precision M5 12.5" Barreled .308 Upper Receiver with Atlas S-ONE Rail - Black
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