Top 10 Myths About Body Armor | Atomic Defense
Remember, body armor is rated from Level IIA to Level IV by the NIJ. H. For example, level IIA is capable of stopping a 9MM full metal jacket round at 1120 feet per second, but the same round at 1205 fps would require Level II body armor to stop, while the same round at 1430 fps would only be stopped by Level IIIA body armor or better.