Geissele Automatics Super Duty MOD 1 5.56 NATO Complete AR-15 Upper Receiver - 10.3" - BLEMULA

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

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

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

ONE HORSE AR15 A3 Stripped Upper Receiver Anodized

TACFIRE AR-15 Billet Slick Upper Receiver Black

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

GUNTEC AR15 SLABSIDE STRIPPED BILLET UPPER RECEIVER BLACK