The FN 509 Midsize (without MRD) is the standard iron-sight variant of FN's mid-size 509, providing the carry-optimized Glock 19-class dimensions with FN's 509 ergonomics for buyers who prefer iron sights or plan aftermarket optics work without the factory MRD cut. Type: Pistol Action: Semi-Automatic Caliber: 9mm Capacity: 15 Year introduced: 2021, Belgium Weight: 27 oz Overall length: 7.1" Status: Active Intended use: concealed_carry, law_enforcement, service