Aero Ar9 Lower Receiver 9/40 Blk

The Aero AR9 Lower Receiver 9/40 Black from Aero Precision delivers billet-grade aesthetics in a forged aluminum platform purpose-built for 9mm and .40 caliber pistol builds. This precision-machined component serves as the serialized foundation for custom AR-9 and AR-40 carbine assemblies, engineered to simplify the build process for gunsmiths and experienced builders who demand tight tolerances and reliable functionality.

Machined from 7075-T6 aluminum, this lower receiver features proprietary components pre-installed from the factory, including a threaded bolt catch pin for streamlined installation and a flared magazine well designed to accelerate magazine changes and improve reload speed under pressure. The enhanced forging process yields a rigid structure that maintains headspace integrity while keeping weight minimal. At 1.19 lbs, the receiver remains lightweight without sacrificing structural integrity required for consistent cycling and long-term durability in 9mm and .40 platforms.

This platform suits competitive shooters, training-focused builders, and operators constructing dedicated 9mm or .40 pistol-caliber carbines for close-quarters work. The flared magazine well and factory-installed features reduce assembly friction and are particularly valued in builds prioritizing reliability and quick handling. The black anodized finish provides corrosion resistance in field conditions while maintaining the professional appearance expected of Aero Precision components.

Aero Precision lower receivers for 9mm and .40 platforms are recognized across the industry for consistent quality control and tight machining tolerances that facilitate reliable function and consistent performance across diverse ammunition types. This particular design reflects the company's commitment to feature-rich manufacturing that reduces builder workload without compromising precision.