Single-stack micro-compact 9mm from FN designed for deep concealment. The 503 is FN's thinnest 9mm handgun, sharing design language with the 509 series but in a pocket-size package. Type: Pistol Action: Semi-Automatic Caliber: 9mm Capacity: 6 Year introduced: 2021, Belgium/USA Weight: 18.7 oz Overall length: 5.9" Status: Active Intended use: Carry