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Lower Group Mk17 for 9mm radial delayed blowback uppers. Uses Sig Sauer P320/M17/M18 magazines. Available in Cerakote finishes. Includes RipStock, ZEROED Drop-In Trigger, ZEROED Pistol Grip, ZEROED Ambi Safety, and ZEROED AR15 Bolt Catch. Mk17 lowers are designed for use with CMMG 9mm radial delayed blowback uppers only. Lifetime Quality Guarantee.
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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