Expo Arms 16" 5.56 NATO AR-15 Barreled Upper Receiver - 15" M-LOK Handguard - A2 Flash Hider - Open Box

RADICAL FIREARMS 223 Rem/5.56 NATO 16in Black Complete Upper Assembly (CFU16-5.56SOC-15RPR)

AERO PRECISION AC-15M RIFLE - 5.56 NATO 16" BBL BLACK

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

Handguard - Aero Precision AR15 15" Enhanced M-LOK, Gen 2 - Anodized Black

LUTH-AR A1 Stripped Upper Receiver 223/5.56mm Aluminum Black Hardcoat Anodize Receiver For M16 (UR-01-M16)

Del-Ton Sierra 316 556 Nato 16" Barrel 11" Samson EVO KeyMod Handguard SMORH160

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