Battle Arms Development Workhorse Stripped AR-15 Upper Receiver - FDE - BLEM

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

GUNTEC AR15 SLABSIDE STRIPPED BILLET UPPER RECEIVER BLACK

APF AR-15 Stripped Billet Lower Receiver - Matte Black

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

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

LBE Unlimited M4 Stripped Upper Receiver, Fits AR15, Black Finish ARSTUP