NATO wanted a replacement for its 9x19mm Parabellum firearms; what it got is the ultimate special ops weapon.
The FN Herstal P90 is a compact but powerful sub-machine gun. It was designed for vehicle crews, support personnel, special forces and counter-terrorist groups.
It's an ugly futuristic-looking weapon. The bullpup design with ambidextrous controls and top-mounted magazine make it unconventional. But make no mistake, this is an incredibly useful weapon. It's so effective that it's currently in service with military and police forces in over 20 nations throughout the world, according to this video.