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It seems like you're asking about NIJ (National Institute of Justice) IIIA armor, which is a standard for ballistic body armor in the United States. NIJ IIIA refers to a specific level of protection provided by the armor https://armored1.com/. NIJ IIIA armor is designed to stop handgun rounds up to .44 Magnum, including 9mm, .357 SIG, and .44 Magnum
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