This guide details the installation and testing of the DFCO DOS BOOT +2 Mag Extension for Magpul PMAG Gen 3 magazines. The presenter, demonstrating high expertise, shows how to attach the extension and confirms its compatibility across various PMAG capacities. Live fire testing in .300 Blackout and 5.56/.223 calibers validates the extension's reliability, adding +2 rounds to standard capacities.
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