This Aero Precision M4E1 complete lower receiver drops straight onto any mil-spec AR-15 upper for a ready-to-shoot build. Machined from 7075-T6 aluminum and finished in durable black anodizing, it ships fully assembled with a mil-spec lower parts kit, carbine buffer tube, buffer, spring, A2 pistol grip, and M4 collapsible stock. It's a fast, reliable foundation for a custom rifle or pistol build without sourcing and fitting parts individually.
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