This video provides an expert-level test of soft body armor's capability against 9mm rounds fired from a 16-inch rifle barrel. The host, demonstrating high authority and expertise, explains the physics behind barrel length affecting velocity and confirms the Armored Republic AR500 backpack insert successfully stopped the rifle-fired 9mm rounds. The test highlights that 9mm ammunition is optimized for pistol-length barrels, showing limited velocity gains from longer rifle barrels.
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