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

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

AERO PRECISION M4E1 Threaded Complete Upper 16" 5.56 Barrel w/ 15" M-LOK ATLAS R-ONE Handguard - BLK

AERO PRECISION M4E1 Complete Upper 5.56 NATO 16" HBAR CMV Barrel, 15" ATLAS R-ONE M-LOK Handguard

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

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

BUSHMASTER Bravo Zulu 16" 450 Bushmaster w/ 14" Free-Float M-LOK Handguard | Black

CMMG 55BB40BMB Resolute MK4 5.56x45mm NATO 16.10", Midnight Bronze, M-LOK Free-Float Handguard for AR-Platform (No BCG or Charging Handle)