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The FN Five-seven (FN 57) is a semi-automatic pistol designed and manufactured by FN Herstal in Belgium. Named after the 5.7×28mm cartridge, the FN 57 was developed alongside the FN P90 personal defense weapon and introduced in 1998 as a companion pistol. Designed in response to the increasing use of body armor, the FN 57 is notable for its significantly greater muzzle velocity and higher magazine capacity compared to other handguns due to the greater chamber pressure and smaller diameter of the 5.7x28mm round. The FN 57 airsoft gun is produced by two brands, Tokyo Marui and Marushin, these come in the form of the Tokyo Marui FN 57 Airsoft Green Gas Pistol and the Marushin FN 57 Airsoft USG (6mm)