AERO PRECISION M4E1-T Complete Upper 11.5" 5.56 Barrel RM9.3 FDE

Aero Precision AR-15 M4E1-E Barreled Upper Receiver 5.56x45mm NATO 14.5" Barrel 12.7" ATLAS R-ONE Handguard with Pinned Gamma SL Muzzle Device Black

Aero Precision AR-15 M4E1-E Barreled Upper Receiver 5.56x45mm NATO 13.9" Barrel 12.7" ATLAS R-ONE Handguard Black

Aero Precision AR-15 M4E1-E Barreled Upper Receiver 5.56x45mm NATO 16" HBAR Barrel 15" ATLAS R-ONE Handguard Black

Aero Precision M4E1-T Barreled Upper Receiver, 18" .223 Wylde SS QPQ Rifle Length Barrel, RM16.6 - FDE

Aero M4e1-t Complete Upper 13.9 Cmv Mid Fde

Aero Precision AR-15 M4E1-E Barreled Upper Receiver 300 AAC Blackout 16" Barrel 15" ATLAS R-ONE Handguard Black

AERO PRECISION M5 20" .308 CMV Complete Upper Receiver w/ ATLAS S-ONE M-Lok 15" Handguard