What Do The NIJ Protection Levels Mean? | Bulletproof Zone
https://bulletproofzone.com/blogs/bullet-proof-blog/nij-protection-levels-choose-the-right-vest-for-you
WEBMay 19, 2021 · There are currently five levels in use - Level IIA, II, IIIA, III, and IV - and each covers a different caliber of bullet. We'll help you understand all the NIJ levels so you can assess which level defeats the range of threats most likely to come your way.
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