How a FN Five-seven works

The FN Five-seven, trademarked as the Five-seveN, is a semi-automatic pistol designed and manufactured by Fabrique Nationale d’Armes de Guerre-Herstal (FN Herstal) in Belgium. The pistol is named for its (.224 in) bullet diameter, and the trademark capitalization style is intended to emphasize the manufacturer’s initials—FN. The Five-seven pistol was developed in conjunction with the FN P90 personal defense weapon and the FN 5.7×28mm cartridge. The P90 was introduced in 1990, and the Five-seven was