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Aero Precision APAR620550: The Aero Precision EPC-9 Complete Lower Receiver is the base for your AR9 build. This lower receiver comes without a stock or brace, allowing the builder flexibility to choose the configuration. Includes: EPC-9 Lower Receiver, A2 Grip, Lower Parts Kit, Enhanced Buffer Tube, EPC 7.7oz Buffer, M5 Carbine Buffer Spring, Castle Nut/End Plate. Features: Threaded bolt catch pin for easy installation; Integrated enlarged trigger guard to prevent damage; Threaded takedown pin detent recess for installing a detent and spring with a single 4-40 set screw; Flared magazine well for quick reloads; Proprietary components pre-installed; Standard AR-15 takedown/pivot pin lug pattern; Machined from 7075-T6 aluminum; Compatible with standard Glock magazines.
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A comprehensive overview of every major component in an AR-15 build—including what's inside bolt carrier groups and parts kits—organized by assembly for new builders.
12 min read
Guide
A neutral guide to component strategies for left-handed shooters, left-eye dominant right-handed shooters, and those managing eye/hand dominance mismatches. Covers ambi uppers, charging handles, gas system tuning, and real-world tradeoffs.
6 min read