Aero Precision Aero M4e1 Pro 5.56 NATO OD Green Carbine

The Aero Precision M4E1 Pro Compensator Lower Receiver in Olive Drab Green is a semi-automatic carbine-length lower purpose-built for 5.56 NATO/.223 Remington ammunition. This is the foundation component of an AR-platform rifle system, engineered to strict tolerances by Aero Precision—a manufacturer known for precision machining and consistent quality control in the tactical rifle market. The anodized olive drab green finish provides corrosion resistance and a professional, low-visibility aesthetic suitable for duty, training, and precision shooting applications.

This complete lower receiver assembly arrives factory-finished with a Magpul MOE grip—a proven ergonomic control that has become standard on modern carbines—and a Magpul SL carbine-length stock. The carbine stock configuration keeps overall length manageable while maintaining a full length-of-pull suitable for a range of shooter body frames. Weighing 1 lb, the lower is compatible with any upper receiver on the AR-15 platform, making it a modular platform choice for builders seeking standardized, drop-in integration. The semi-automatic fire control group and receiver geometry comply with civilian sporting rifle specifications.

This configuration is ideal for shooters building a 5.56 NATO patrol carbine, precision rifle platform, or dedicated training system. The complete lower eliminates assembly variables and accelerates build timelines for experienced AR gunners, while the Magpul furniture provides comfortable controls without additional investment. Olive drab green offers visual distinction from black-dominant platforms while maintaining operational aesthetics. Buyers integrating this lower should confirm upper receiver compatibility and ensure all federal firearms regulations and state/local requirements are met before completing the build or taking possession.