This guide outlines options for building a budget-friendly AR-9, focusing on magazine compatibility and lower receiver choices. It details the KAK Colt Magwell Adapter, Torkmag MagDapt for Glock mags, Mean Arms Endomag for PMAGs, and dedicated PSA AR-9 lowers. The expert analysis highlights pros and cons, reliability, and cost-effectiveness, recommending a dedicated lower for those starting from scratch.
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