Not sure that Kevin’s test, though well-intentioned, is valid. Under his testing procedure with the plate clipped to two lathes with nothing but thin air behind it, the plate is giving way to the energy force of the bullet and only being knock away into the thin air behind it. The plate isn’t having to take the full energy force of bullet shot into it as it would if were strapped to the mass of a human body. Repeat the tests with the plate strapped tightly to something of a size and mass similar to a human body and see what happens. The bullets might still not penetrate the plate, but you’ll never know unless it’s tested.
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