Aero Ar9 Lower Receiver 9/40 Blk

The Aero AR9 Lower Receiver 9/40 Black from Aero Precision is a dedicated platform engineered for both 9mm and .40 caliber builds, catering to the needs of tactical operators and civilian shooters seeking compact, cost-effective alternatives to traditional rifle platforms. This lower receiver serves as the serialized firearm foundation for builders looking for modular construction flexibility or agencies requiring pistol-caliber carbines for close-quarters work.

Manufactured from 7075-T6 aluminum, a material standard across military-specification small arms platforms, this component ensures rigidity and durability under repeated firing cycles and tactical stress. The receiver is optimized for AR9 and AR40 upper assemblies, featuring precise feed ramp geometry and magazine-well dimensions that support reliable function with both 9mm Luger and .40 S&W ammunition.

Law enforcement armories, tactical teams, and civilian builders benefit from the matte black finish that resists corrosion and eliminates reflective surfaces critical for operational discretion. The compact form factor reduces the overall footprint compared to 5.56 platforms, making it an ideal choice for various applications.