This video demonstrates a common 'trick' for AR-15 magazines, specifically Magpul PMAGs, showing that both windowed and standard 30-round variants can reliably hold an additional 31st round. The instructor, exhibiting intermediate expertise, uses a speed loader to efficiently test this extended capacity on a non-windowed PMAG, confirming it holds one extra round beyond its advertised capacity. The experiment concludes that both versions of the PMAG can accommodate 31 rounds.
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