FN 66100574: 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-inch 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. The improved controls aid in manipulation, improved texturing on the two included backstraps provides better recoil management, and a atter faced trigger allows for more controllable trigger press and cleaner break.