How to choose hard armor plates ? With the rapid development of science and technology, firearms become more and more powerful. Do you know how to choose a practical hard armor plate when it comes to an active shooter incident? Here is some information for you to make an armor plate protection choice. According to the NIJ standard, hard armor plates have two protection levels, III and IV. NIJ level III plates are rated to stop regular rifle bullets, such as M80 NATO Balls, AK lead cores. NIJ level IV plates are rated to stop armor piercing projectiles, such as M2 Armor Piercing (AP), AK Armor Piercing Incendiary (API). Given the difference between hard armor plates with different protection levels, you can choose hard armor plates rationally. Currently, there are mainly three materials used to make hard armor plates, steel, polyethylene, and ceramic, and their characteristics are as follows: (PE plates and ceramics plates are all available in Newtech...