KNIGHTS ARMAMENT SR-15 Upper Rcvr Assembled Notched for AR-15

GUNTEC AR15 SLABSIDE STRIPPED BILLET UPPER RECEIVER BLACK

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

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

BUSHMASTER QRC Upper 5.56 NATO 16" - Black

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

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