Del-Ton Lightweight 5.56 NATO Complete Upper Receiver - Nitride Barrel - 16" - Open Box

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

ONE HORSE 16" 5.56 NATO Complete Upper Receiver

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

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

AERO PRECISION M5 Complete Upper 22" 6.5 CM SS Fluted SM15 Ano

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

TACFIRE AR-15 Billet Slick Upper Receiver Black