2A ARMAMENT BALIOS-LITE Gen 2 AR15 Billet Upper Receiver | Black

GUNTEC AR15 SLABSIDE STRIPPED BILLET UPPER RECEIVER BLACK

JL BILLET AR-15 5.56 SKELETOR LIGHT WEIGHT MATCHED SET BLACK

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

Howa HMXL223KAC M1500 Mini Excel Lite 223 Rem 20" TB 5+1, Kryptek Altitude HTI Excl Lite Chassis, Black Folding Stock

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

APF AR-15 Stripped Billet Lower Receiver - Matte Black

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