New Frontier C4 Upper Receiver Ar15 Stripped Billet Black C4UPPER-STD

GUNTEC AR15 SLABSIDE STRIPPED BILLET UPPER RECEIVER BLACK

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

Radian Weapons R0027 Complete Upper 300 Blackout 9" Black Barrel, 7075-T6 Aluminum Radian Black Receiver, Extended with Magpul M-LOK Handguard for AR-15

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

BUSHMASTER QRC Upper 5.56 NATO 16" - Black

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