Just as a heads up, if you look at the wiki page regarding the real lilfe FN FiveSeven and the FN P90, there was/is non-ap ammo made for that caliber. They made tracers, hollow points and V-max HPs (2 varieties). This would remove the AP from the gun, but would in turn give you the benefits of HP ammo. Good for instances where you are not fighting armored baddies.
My Pointman carries a FiveSeven and a P90, normally loaded with standard AP ammo, but he also carries a magazine for each loaded with HP rounds.