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Lower Receiver Assembly MkGs (Lower receiver, mag catch, BHO linkage). The MkGs lower is designed to accept either 9mm or .40 S&W Glock and SGM magazines. Features include an integrated trigger guard, last round bolt hold open, oversized magazine release, flared magwell, and multiple finish options. The MkGs lower receiver can utilize any AR-15 mil-spec Lower Parts Kit or Drop-in Trigger of choice, making the MkGs a customizable multi-caliber lower receiver. Each receiver is finished in one of seven premium Cerakote finishes. MkGs lowers are designed to work with MkGs .40 S&W or 9mm Radial Delay Blowback uppers only.
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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