Aero Precision M4E1 Stripped Lower Receiver AR-15 .223 Rem/5.56 NATO, Black Anodized - APAR600001C

The M4E1 Stripped Lower Receiver is a forged 7075-T6 aluminum component machined to mil-spec dimensions and compatible with all standard AR-15 parts. Features a threaded bolt catch roll pin for simplified assembly and black hardcoat anodized finish for corrosion resistance. This multi-caliber lower receiver accommodates .223 Remington and 5.56x45mm NATO ammunition.