Being a flak vest, it is specifically designed for utilization against flak. Flak is basically shrapnel from explosive ordinance. However, the method of stopping flak is almost identical to the method for stopping bullets. *MOST* Flak jackets do very poorly against bullets. This is because those vests generally tend to use lower grade ballistic fiber in less plies than are needed to stop a bullet.
**Flak vest ARE NOT bullet proof vests**