Spikes Tactical Midlength Complete 5.56x45mm NATO 16\

Spikes Tactical .223 Rem/5.56 16" Barrel Complete Upper Assembly, Mil-Spec Phosphate Coated, 9" Black Free Float BAR2 Rail - STU5025-R9S

Spikes Tactical 16" Classic Upper 5.56x45mm/.223 Remington 1:7 Quad Rail Mid-Length, Black

Spikes Tactical .223 Rem/5.56 16" Barrel Complete Upper Assembly, Mil-Spec Phosphate Coated, Black Mid-Length - STU5435-MLS

Spikes Tactical .223 Rem/5.56 16" Barrel Complete Upper Assembly, Mil-Spec Phosphate Coated, Black M4 - STU5025-M4S

Spikes Tactical .223 Rem/5.56 16" Barrel Complete Upper Assembly, Mil-Spec Phosphate Coated, 12" Black Free Float SAR3 Rail - STU5035-S2S

Spikes Tactical .223 Rem/5.56 16" Barrel Complete Upper Assembly, Mil-Spec Phosphate Coated, 12" Black Free Float BAR2 Rail - STU5435-R2S

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