Expo Arms Barreled AR-15 Upper Receiver - 5.56 - 10.5"

AERO PRECISION AC-15M RIFLE - 5.56 NATO 16" BBL BLACK

Wraithworks Billet Slick Side AR-15 Upper Receiver - Black | No Forward Assist or Brass Deflector

AERO PRECISION M4E1 Threaded Complete Upper 16" 5.56 Barrel w/ 15" M-LOK ATLAS R-ONE Handguard - BLK

AERO PRECISION M5 308 Win Assembled Upper Receiver | OD Green

GUNTEC AR15 STRIPPED BILLET - UPPER RECEIVER BLACK

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

BUSHMASTER M4 Type Patrolman Flat Top A4 Upper 5.56 16" Black