Spike's Tactical Complete AR-15 Upper Receiver With FSB - 5.56 - 16"

SPIKES TACTICAL Complete Upper 5.56x45 16" Black Mid-length AR15

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

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

Foxtrot Mike Products MIKE-102 Gen 2 Complete AR-15 Upper Receiver - .223 Wylde - 12.5"

Aero Precision AR-15 Stripped Upper Receiver - Slick Side - Black

Aero Precision M4E1 Threaded Barreled AR-15 Upper 5.56 Carbine Length ATLAS R-One - 16"

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