The FN Five-seveN MK3 FDE checks every box for shooters who search “used FN Five-seveN for sale,” “best 5.7 pistol,” or “low-recoil duty handgun.” This gently used example combines the legendary flat-shooting 5.7×28 mm round with FN’s updated MK3 slide cut for mini-red-dot sights—giving you duty-grade accuracy with race-gun speed. Want to know if it’s right for home defense, range fun, or even small-game varmint control? Keep reading.