Grey Ghost Precision MKII Light AR-15 Billet Receiver Set 223 Rem/5.56 NATO Black

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

JL Billet Skeletor AR-15 5.56 Receiver Set

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

TacFire AR-15 .223 / 5.56 Unassembled Upper Receiver Kit - 14.5"

Guntec USA AR15 Upper Receiver Compatible With AR-15 Accessories

GREY GHOST PRECISION AR-10 Billet Receivr Set 308Win Blk Flared MagWell

RUGER AR556 5.56 NATO AR15 Stripped Lower Receiver - Black