LMT Upper Receiver Assembly - AR-15 - M4 - Black Anodize

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

TACFIRE AR-15 Billet Slick Upper Receiver Black

AERO PRECISION M5 20" .308 CMV Complete Upper Receiver w/ ATLAS S-ONE M-Lok 15" Handguard

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

ONE HORSE AR15 A3 Stripped Upper Receiver Anodized

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