Aero Precision M4e1 Assembled Upper Receiver 10.5" 5.56mm Carbine Length
Aero Precision M4e1 Assembled Upper Receiver 10.5" 5.56mm Carbine Length, Aero Precision's M4E1 5.56mm 10.5" Carbine Upper Receiver comes fully assembled, lacking only a bolt/carrier group and charging handle - the two most popular components for customization. At its heart is Aero's forged M4E1 receiver that combines the look of a custom billet receiver with "mil-spec" parts compatibility (including BCG and charging handle) and a proprietary attachment system for the included handguard. Aero has fitted the M4E1 5.56mm 10.5" Carbine Upper Receiver with a barrel of high-grade 4150 chrome-moly-vanadium carbon steel chambered for 5.56mm NATO ammunition, so it will safely handle civilian .223 Remington ammo too. The versatile 10 Mfg: Aero Precision