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Precision machined from forged 7075-T6 aluminum. The CMMG MK4 AR-15 stripped lower receiver is the mil-spec foundation for your next build. Finished in Armor Black, it can be assembled using any mil-spec Lower Parts Kit (LPK).
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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