Daniel Defense AR-15 M4A1 Upper Receiver Assembly 5.56x45mm 14.5″ Pinned Barrel

The Aero Precision M4E1 Threaded Stripped Upper Receiver features the same profile as Aero's other M4E1 upper receivers but is threaded to accept a standard AR-15 barrel nut. Designed to match seamlessly with Aero's M4E1 lower, this upper gives you billet looks without the billet price. Does not include forward assist or port door.

Ruger AR-556 modern sporting rifle lower receiver is CNC-machined from forged 7075-T6 aluminum, is Type III hard-coat anodized and makes a great lower for those looking to build their own modern sporting rifle.