BUSHMASTER QRC Upper 5.56 NATO 16" - Black

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

TACFIRE AR-15 Billet Slick Upper Receiver Black

BEAR CREEK ARSENAL 5.56 NATO COMPLETE UPPER 10. BRL 1:7 TWIST CARBINE LENGTH GAS MLOK

GUNTEC AR15 SLABSIDE STRIPPED BILLET UPPER RECEIVER BLACK

Sons of Liberty Gun Works SOLGW 14.50" Upper 5.56x45mm M-LOK Rail - Tactical Excellence - M4L89BSCHF14.5

Kgm Technologies | ISURG-556-16-BLK | 5.56 NATO 16.7 in

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