Aero Precision APRA600001C MOD 4 6061-T6 Aluminum

The Aero Precision APRA600001C MOD 4 6061-T6 Aluminum receiver set is the foundation for building a precision AR-platform rifle trusted by law enforcement, military units, and civilian shooters who demand reliability under demanding conditions. This forged aluminum upper and lower receiver pairing serves as the regulated component of any AR-15 or modern sporting rifle platform, providing the structural backbone necessary for consistent accuracy and long-service life. Whether you're assembling a duty rifle, precision build, or high-round-count training platform, Aero Precision's MOD 4 configuration delivers the dimensional consistency and material quality required for professional-grade performance.

Manufactured from 6061-T6 aluminum alloy, this receiver set benefits from decades of Aero Precision's engineering refinement in metallurgy and CNC tolerancing. The MOD 4 designation reflects the current platform standard, incorporating refined indexing, improved rail interface geometry, and optimized feed ramps for reliable ammunition feeding across a wide spectrum of loadings and bullet profiles. The 6061-T6 T-heat-treatment provides an ideal balance of machinability and post-machining strength, ensuring receivers maintain dimensional stability through thousands of rounds and multiple build cycles. At 1.38 lbs total weight, the receiver set remains lightweight without sacrificing the rigidity necessary for sub-MOA accuracy potential and long-term durability in military and law enforcement service environments.

This receiver set is compatible with all standard AR-15 components, trigger assemblies, and barrel extensions using Mil-Spec dimensioning, making it ideal for gunsmiths, armorer-level builders, and professional training facilities standardizing on proven platforms. Installation requires basic gunsmithing knowledge and proper assembly tooling; alignment pins, castle nuts, and forward assist components are common hardware items available separately. Professional armorers and law enforcement units regularly specify Aero Precision receivers for fleet-wide standardization due to interchangeability and predictable performance across high-volume training and operational deployment cycles.