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.
This video tests 110-grain subsonic .223 ammunition, evaluating its terminal performance and reliability. The test reveals that while the ammunition is subsonic from a 16-inch barrel, it did not reliably cycle the action of the AR-15, requiring manual cycling. Terminal ballistics showed significant yawing and a total penetration of 19.5 inches in ballistic gelatin, with initial disruption around 3 inches. The presenter suggests limited practical application for typical users, comparing its niche utility to subsonic 300 Blackout.
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