According to tests done, using the SS190 round, one of three types that are available for the P90, it will penetrate 48 layers of standard body armor kevlar up to a range of 150 M. Using the same round, it will defeat level three body armor up to a range of 200M. It's a neat little pop gun. Our military has adopted it as well. Canadians have always liked anything made by FN. :)

Three rounds are available for the P90 at this time. The standard ball round, called the SS190, features an overall length of 1.6 inches (40.5 mm), a projectile weight of 31.0 grains (2.02 grams) and a muzzle velocity of 2,345 fps (715 mps). The SS190 projectile features steel core in front of an aluminum core toward the base. The bullet penetrates about 10 inches (26 cm) of 10 percent ballistic gelatin, according to testing conducted at the Royal Canadian Mounted Police Academy in September 1997. The SS190 round will also penetrate 48 layers of Kevlar, the typical "Flak jacket" (including CRISAT protection, which is a combination of titanium and Kevlar) worn by infantry to protect them from shrapnel produced by exploding devices, or a standard PASGT (U.S. Kevlar) helmet at 150 meters (164 yards), which is the effective range of the P90 Personal Defense Weapon. The weapon will still defeat Level 3 body armor at 200 meters (219 yards). The "maximum effective range" using the NATO definition (the maximum range where a weapon's projectile will still deliver 85 joules on target) is 400 meters (437 yards). Thus, according to NATO standards, the P90 is theoretically able to deliver a lethal wound on a protected target at 200m and an unprotected target at 400m if the round hits a vital area. Personally, I would not be enthusiastic about engaging targets beyond 150m with the standard SS190 round