Aero M5 Ar10 Complete Lower Blk

The Aero M5 AR10 Complete Lower Receiver in Black is a purpose-built foundation for .308 Winchester rifle builds. As a complete lower assembly, it arrives fully assembled and ready to pair with an upper receiver and fire control components, eliminating the complexity of individual part sourcing for operators and shooters building their first large-caliber AR platform rifle.

The M5 lower is engineered around the AR10 platform and accepts standard .308 components and magazines without modification. The rear takedown pin detent hole is threaded for a 4-40 set screw, eliminating the need for a separate spring-loaded detent pin that can be lost in the field. The bolt catch assembly uses a threaded screw pin design rather than a traditional roll pin, improving reliability and reducing maintenance complexity during extended shooting sessions. An integrated trigger guard is machined into the receiver, streamlining assembly and reducing potential snag points during transitions. Selector markings accommodate 45, 60, or 90-degree safety levers, giving builders flexibility in controls setup based on their operating preferences and ergonomic needs.

This complete lower serves precision rifle builders, designated marksman rifle (DMR) enthusiasts, and shooters stepping up from 5.56 to larger calibers. It's suited for long-range training, 3-gun competition, and duty rifle builds where component consistency and quality machining matter. The complete assembly approach eliminates individual parts compatibility questions, making it an efficient choice for operators who prioritize build speed and verified fit.

Aero Precision's M5 platform occupies a performance tier above entry-level lowers while remaining accessible to serious hobbyist builders. The attention to detail—threaded detent holes, screw-pin bolt catch, integrated trigger guard—reflects lessons learned from operator feedback and high-round-count testing.