What Calibers Can Body Armor Stop?
This guide breaks down the NIJ standards for body armor, explaining the capabilities of Level 3A, Level 3, Level 3+, and Level 4 armor. It clarifies what common handgun and rifle calibers each level is designed to stop, including specific ammunition types like M80 Ball, M855 Green Tip, and M2AP. The information is presented with an authoritative tone, drawing from the expertise of a GUNBROS representative knowledgeable in NIJ standards and specific ammunition designations.











