The FN 5.7x28mm cartridge is a bit of an oddity. Developed from the ground up by FN Herstal of Belgium, the round was designed for use in handguns and personal defense weapons. It is a small-caliber bottlenecked cartridge that bridges the gap between round-nosed pistol cartridges like the NATO 9x19mm Parabellum used in the M9 … Continued