The FN 509 Midsize MRD is a purpose-designed mid-size variant in the 509 family, falling between the Compact and the full-size in grip length and barrel length. The Midsize was developed after market research showed demand for a carry pistol larger than the Compact but shorter than the full-size, with optics-ready as standard. Type: Pistol Action: Semi-Automatic Caliber: 9mm Capacity: 15 Year introduced: 2021, Belgium Weight: 27.5 oz Overall length: 7.1" Status: Active Intended use: concealed_carry, law_enforcement, service