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The Macaroon is a highly customizable MAC-11 lower receiver. It utilizes the proven combination of AR fire control group and Glock magazines, and features a robust LRBHO (last round bolt hold open) and reversible magazine release. No proprietary or custom fabricated parts are required. Also included in this release is the BentoBox, a compensator designed to pair with the Macaroon, and the MCXish folding brace/stock.