Actually, I believe that there is some confusion between Threat Level 3a and 3. Level 3a is rated to stop 9x19mm FMJ from a SMG and .44 Magnum SWC from a 6" barreled revolver. Level 3 is rated to stop conventional projectiles (FMJ, JSP, & JHP)fired from rifles, including the 5.56x45mm, 7.62x39mm, and 7.62x51mm. Level 4 is rated for rifle cartridges using AP projectiles.
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