Levels of Bulletproof Protection - NIJ Level IIA, II, IIIA ...
Level IIIA is the fourth level of protection, so it will also stop all rounds covered by lower levels of body armor (Level I, Level IIA, and Level II). This includes: 8 g (124 gr) 9 mm FMJ RN bullets at a velocity of 398 m/s ± 9.1 m/s (1305 ft/s ± 30 ft/s)