Lvl 4 body armor3/10/2023 ![]() ![]() What is the Difference Between Level 3 and Level 4 Armor? NIJ Level 3 Body Armor Without even bending the core, the bullet pierces a 2.5cm thick sheet of steel. The 7.62mm Springfield rifle bullet has a muzzle velocity of 2850 ft/s or 877 meters per second. However, at Level 4, the speed of the bullet is more deadly than its size. Pistol shots go completely unnoticed by the person wearing body armor. Other smaller calibers and lower velocity ammunition also cannot penetrate level 4 ballistic plates.
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