The FN 509 MRD (Miniature Red Dot) is the optics-ready variant of the full-size 509, adding a factory optics cut and suppressor-height sights to the standard 509 without the threaded barrel of the Tactical. Bridges the gap between the standard 509 and the 509 Tactical for shooters who want factory optics capability without tactical barrel length. Type: Pistol Action: Semi-Automatic Caliber: 9mm Capacity: 17 Year introduced: 2018, Belgium Weight: 25.5 oz Overall length: 7.4" Status: Active Intended use: service, law_enforcement, competition