Daniel Defense M4A1 RIS II Complete AR-15 Upper Receiver - 5.56 - 14.5" P/W - FDE
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Geissele Automatics Super Duty Barreled AR-15 Upper Receiver - 5.56 - 14.5" - No Muzzle Device
Daniel Defense M4A1 RIS III Complete AR-15 Upper Receiver - 5.56 - 14.5" P/W
Geissele Automatics Super Duty Barreled AR-15 Upper Receiver - 5.56 - 14.5" - DDC - No Muzzle Device
Geissele Automatics URG-I Near Clone Complete AR-15 Upper Receiver - 5.56 - 14.5" P/W - FDE
