This video demonstrates the installation and function of the Stern Defense Mag-AD adapter system, which allows users to convert an AR-15 lower receiver to accept pistol magazines from various manufacturers, including Glock and Smith & Wesson M&P. The process involves removing the upper receiver, installing the adapter with its anti-vibration gib and set screws, and then reattaching the upper. The adapter facilitates caliber conversions and enables the use of common pistol magazines in an AR-15 platform.
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