YHM MR7 SERIES UPPER RECEIVER GROUP 6.8MM YHM-7305-68

AERO PRECISION AR15 5.56 Pro Series Bolt Carrier Group - Black Ni

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

AERO PRECISION M4E1-T 5.56 NATO 11.5" Complete Upper Receiver | Black

ALEXANDER ARMS Hunter Complete Upper 6.5 Grendel 18" Blk AR-15

ALEXANDER AR15 STANDARD UPPER - 300AAC 16" BLACK

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

TacFire AR-15 7.62x39 Unassembled Upper Receiver Kit - 5"