The FN Five-seven is a semi-automatic pistol designed and manufactured by FN Herstal in Belgium. The pistol is named for the 5.7×28mm cartridge's bullet diameter, and the trademark's capitalization style is intended to emphasize the manufacturer's initials—FN. The Five-seven MK2 model was introduced in 2013, and is now the standard version of the Five-seven offered by FN Herstal.