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AERO PRECISION AR15 5.56 NATO / 223 Rem 20" Complete Upper Receiver w/ Carry Handle | Black

BUSHMASTER M4 Type Patrolman Flat Top A4 Upper 5.56 16" Black

BATTLE ARMS Workhorse Upper Recv 5.56 16" AR-15 Sniper Gray

Battle Arms Development WH556-URS-ODG Workhorse Upper Receiver Aluminum OD Green Anodized Receiver for AR15/M4

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