PSA Marauder 7" Nitride 1:7 Pistol Length 5.56 NATO AR-15 Upper Assembly, Black

AERO PRECISION AR15 5.56 NATO / 223 Rem 20" Complete Upper Receiver w/ Carry Handle | Black

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

TacFire AR-15 .223 / 5.56 Unassembled Upper Receiver Kit - 14.5"

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

TacFire AR-15 .300 Blackout Unassembled Upper Receiver Kit - 5"

Spikes Tactical 16" Upper 5.56x45mm 1:7 Quad Rail Mid-Length with BCG, Black - Enhanced Carbine Upper - STU5035CQ2F

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