This video tests the effectiveness of subsonic 5.56mm and .223 caliber ammunition, which is uncommon for the AR-15 platform. The presenter compares two subsonic rounds (an unknown hollow point and Silent Strike frangible) against a standard supersonic REX bullet by Maker. Key findings include that most subsonic 5.56mm rounds fail to reliably cycle an AR-15 and exhibit significantly reduced energy transfer and wound cavity compared to supersonic counterparts, though penetration can still be substantial.
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