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Yankee Hill Machine billet lower receiver machined 100% in-house from 7075-T6 aluminum. Hardcoat anodized matte black finish. Billet construction offers a stylized profile while maintaining AR-15 compatibility. Caliber options: .223 Rem/5.56 NATO. Model-57 billet lower designed to mimic a standard forged lower with a unique appearance.
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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