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Discover the precision and reliability of Aero Precision's lower receivers, where innovation meets craftsmanship. Engineered with the discerning marksman in mind, the M4E1 Lower Receiver stands out with expertly forged 7075-T6 aluminum construction, ensuring compatibility with all mil-spec AR15 parts. For those venturing into the realm of big-bore ARs, the M5 .308 Stripped Lower Receiver offers a robust foundation, maintaining high-quality interfaces with mil-spec dimensions and premium coatings. Aero Precision's commitment to excellence is evident in their SOLUS actions, available in both long and short configurations, catering to hunters and competitive shooters alike. The PRO Series is designed to excel in the harshest conditions, delivering performance that exceeds expectations. Whether you're building a custom rifle or upgrading an existing platform, Aero Precision's lower receivers provide the reliability and precision needed to enhance your shooting experience. Explore the full range of options and elevate your firearm's performance with components that are engineered to perform without compromise.