Aero Precision APRA600002C MOD 4 6061-T6 Aluminum

The Aero Precision APRA600002C MOD 4 6061-T6 Aluminum receiver set is a precision-engineered component designed for shooters and gunsmiths building AR-platform rifles from the ground up. This upper and lower receiver pairing forms the regulated firearm foundation, making it essential for those who demand quality in every assembly stage. Law enforcement armorers and military small arms technicians consistently specify Aero Precision receivers for their dimensional accuracy and repeatability across production batches—critical attributes when standardizing duty rifle configurations across departments or units.

Machined from 6061-T6 aluminum alloy, this receiver set delivers the strength-to-weight balance that defines modern tactical carbine design. The 6061-T6 temper provides optimal hardness and machinability while resisting corrosion better than lower-grade aluminum, a decisive advantage in field environments where salt spray, moisture, and extended storage test material integrity. Aero Precision's MOD 4 design incorporates refined tolerances and feed ramp geometry that minimize chambering resistance and maximize reliability—benefits field-proven in military contracts and law enforcement duty rifle programs. At 1.34 lbs and measuring 18.4 inches in overall length, this receiver set integrates seamlessly into standard AR-15 platforms without adding unnecessary weight to the shooter's system.

Professional armorers, competition shooters, and civilian tactical rifle builders benefit most from this receiver set's consistent surface finishes and tight tolerances that simplify assembly and reduce troubleshooting downtime. Installation pairs this upper and lower receiver with quality small parts kits, trigger assemblies, and bolt carrier groups—components that build on Aero Precision's foundational accuracy. Whether configuring a duty rifle, precision carbine, or training platform, this aluminum receiver set supports caliber conversions and modular configurations that extend platform utility throughout service life.