A small bottleneck cartridge developed for Personal Defence Weapons by Fabrique Nationale Herstal. Mainly used in the FN Five seveN and the FN P90 PDW's. Even though it has less recoil than a 9x19mm Parabellum round, it is capable of defeating medium ballistic body armour. Superior to the 4.6x30mm HK cartridge according to a NATO evaluation, but not standardized due to Germany and several other countries rejecting it.
They thought they were safe because of their ballistic vests, but our P90's firing 5.7x28mm FN rounds proved them otherwise.
by Ashirg April 14, 2020