The Aero Precision M5 Complete Lower (.308) is a fully assembled lower receiver designed for AR-10-style rifles, providing a ready-to-use foundation for building a large-frame firearm. As a complete lower, it includes all essential components, such as the lower receiver, trigger assembly, safety selector, magazine release, buffer system, and stock. It is pre-assembled and ready to pair with a compatible M5 or AR-10 upper receiver, eliminating the need for further assembly or additional parts. Constructed from high-quality 7075-T6 aluminum, the M5 Complete Lower is precision-machined to ensure durability and compatibility with .308 Winchester and other large-frame AR calibers. It features an integrated trigger guard for added strength and ease of use, and the Mil-Spec lower parts kit ensures reliable performance. Typically equipped with Magpul MOE SL or PRS furniture, the lower provides ergonomic handling and comfort. Finished with Type III hard anodizing for corrosion resistance, the Aero Precision M5 Complete Lower (.308) is an excellent choice for those seeking a robust and reliable foundation for their large-caliber AR build.