The Aero M4E1 Lower Receiver offers the striking aesthetics of a billet design in a robust forged package. Crafted from 7075-T6 aluminum, this custom-designed lower receiver is compatible with all mil-spec AR15 parts. Beyond its visual appeal, the M4E1 features enhanced engineering that rivals higher-priced billet options. It includes several functional upgrades aimed at simplifying the assembly process for at-home builders, making it an ideal choice for custom AR15 projects. Experience the perfect blend of form, function, and ease of assembly with the Aero M4E1.