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Convert your standard mil-spec AR-15, M4, or M16 lower assembly to accept .45ACP M&P magazines with the Mag-AD .45ACP Adapter. In seconds, this adapter installs and enhances your AR platform, enabling compatibility with M&P .45ACP mags. Featuring a last round hold open—a groundbreaking innovation for improved reliability—this adapter is essential for both law enforcement and civilian shooters looking to optimize their AR builds.