Aero Precision APRA600005C MOD 4 6061-T6 Aluminum

The Aero Precision APRA600005C MOD 4 6061-T6 Aluminum receiver set is a precision-engineered foundation component for AR-platform rifle builds. Machined from 6061-T6 aluminum, this MOD 4 upper or lower receiver delivers the dimensional accuracy and material strength demanded by shooters who require repeatable performance and minimal tolerance stack in assembled systems.

6061-T6 aluminum is the industry standard for AR receivers because it balances weight savings with structural rigidity—critical for maintaining zero during sustained fire and ensuring bolt carrier group cycling reliability across ammunition variants. The MOD 4 specification indicates Aero Precision's latest generation receiver geometry, optimized for modern bolt carrier groups and enhanced ergonomic integration. At 1.16 lbs and dimensioned at 3.1 x 3.1 x 14.7 inches, this receiver set fits within standard AR-15 platform dimensions and accepts common aftermarket components without modification. Tight machining tolerances minimize rail wobble and feed-related failures, reducing maintenance intervals and downtime between training cycles.

This receiver set serves competitive shooters, duty-qualified operators, and rifle builders who prioritize precision and repeatability. It functions equally in 3-gun competition, long-range target work, and modular duty-rifle configurations. The MOD 4 design accommodates both milspec and commercial buffer tubes and accepts Picatinny-mounted optics and accessories without secondary adapters, streamlining system integration during build-out or reconfiguration.

Aero Precision receivers are machined domestically and remain the reference standard in the AR aftermarket for dimensional accuracy and finish consistency. The APRA600005C MOD 4 integrates seamlessly into builds from budget-conscious builders to high-round-count competition platforms, offering verifiable quality at a market-competitive price point.