Palmetto State Armory Classic M4 Freedom 16" 5.56 OD Green Upper No BCG & Charging Handle

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

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

Bushmaster AR-15 Complete Upper Minimalist SD 556 Nato AR15 16" 90025

Luth-AR 11.50" Classic Upper 5.56x45mm 1:7 Carbine-Length w/BCG&CH, Black

AMERICAN TACTICAL IMPORTS RIA Milsport 450 Bushmaster Upper 16" Parkerized

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