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PSA AR15 Complete Classic SBA4 Lower. Fully assembled AR-15 pistol lower built around a 7075-T6 aluminum forging receiver with MIL-A-8625F Type III hardcoat anodizing. Features 7075 receiver extension, A2 Classic grip, SB Tactical SBA4 adjustable brace, USGI Classic trigger guard, and standard carbine buffer. Un-notched hammer compatible with 9mm use. Caliber: Multi.
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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.
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