Full-size punch in a compact package with FN's patented Low-Pro le Optics Mounting System and unparalleled modularity of the FN 509 platform, the FN 509 Compact. The pistol is 9mm and striker- red with 3.7" barrel and the capability to accept all higher capacity FN 509 magazines. The patented FN Low-Pro le Optics Mounting System accepts nearly all commercial miniature red dot optics and features blackout iron sights that co-witness.