The FN 509 Compact applies the 509 platform to a compact footprint suitable for concealed carry, using a 3.7-inch barrel and shorter frame. Accepts full-size 509 17-round magazines with grip extension. Available in standard and MRD (Miniature Red Dot) optics-ready configurations. Competes directly with the SIG P320 Compact and Glock 19 in the full-featured compact carry segment. Type: Pistol Action: Semi-Automatic Caliber: 9mm Capacity: 12 Year introduced: 2018, Belgium Weight: 25.5 oz Overall length: 6.8" Status: Active Intended use: concealed_carry, law_enforcement, service