Aero Ar9 Complete Lower 9/40 Blk

The Aero Precision AR9 Complete Lower Receiver in 9mm/40 S&W (SKU APAR620550) is a purpose-built lower assembly engineered for caliber-flexible pistol-caliber platforms. This complete lower accepts Glock-pattern magazines and arrives anodized black, ready for upper receiver integration without additional machining or finishing work.

Aero Precision manufactures this component to mil-spec tolerances, with attention to critical dimensions that ensure reliable function across both 9mm and .40 S&W cartridges. The dual-caliber design simplifies ammunition logistics for shooters who train or operate with both rounds. The A2 grip profile and black anodize finish deliver a standard platform familiar to users transitioning from legacy platforms. Weighing 3.25 lbs, the complete lower is fully assembled—trigger group, safety selector, and magazine well are installed and ready for immediate use upon mating with a compatible upper receiver.

This lower suits builders, law enforcement outfitters, and serious shooters who value magazine interchangeability with duty or training inventories. The Glock-magazine platform is prevalent in professional circles and civilian training communities, making ammunition support and spare magazine sourcing straightforward. Whether assembling a compact PCC (pistol-caliber carbine) for home defense, range versatility, or duty application, this lower provides a stable, regulated foundation.

Aero Precision's reputation for precision machining and consistent quality control makes this complete lower a trusted choice for shooters who demand repeatability. Please verify local and federal regulations governing lower receiver registration and ownership before purchase, as legal requirements vary by jurisdiction.