Aero Precision APRA600004C MOD 4 6061-T6 Aluminum

The Aero Precision APRA600004C MOD 4 6061-T6 Aluminum receiver set is designed for professional-grade AR-platform rifles, making it ideal for law enforcement, military units, and serious civilian shooters. This precision-machined receiver assembly serves as the critical backbone of your build, engineered to exacting tolerances that ensure reliable cycling under demanding field conditions.

Manufactured from 6061-T6 aluminum alloy, the Aero Precision MOD 4 receiver combines lightweight construction at 1.26 lbs with exceptional rigidity and durability. The T6 heat treatment process hardens the aluminum to optimal hardness levels, eliminating flex during firing and maintaining zero-shift across extended shooting sessions. Aero's proprietary design includes tight tolerances on bolt carrier group interface surfaces, magazine well geometry, and trigger pin holes, ensuring that your upper and lower receiver pair with minimal wobble and maximum reliability.

This receiver set is particularly beneficial for builders seeking MIL-SPEC or enhanced duty builds, specifically for calibers such as 5.56 NATO and .223 Remington. The overall dimensions of 3.3 x 3 x 18.4 inches allow this receiver set to integrate seamlessly into modern fighting carbines without sacrificing strength or ergonomic functionality.