The FN 509M MRD brings you the FN Low Profile Optics Mounting System, giving you the option of direct mounting more than 10 different miniature red dot optics to your concealed carry pistol. Featuring a midsized frame, fully ambidextrous controls, all-black co-witness iron sights, standard 10rd capacity and is compatible with larger capacity FN 509 magazines with use of a sleeve. The improved controls aid in manipulation, the new improved texturing on the two included backstraps provides better recoil management and a new flatter faced trigger allows for more controllable trigger press and cleaner break. Includes- two interchangeable backstraps, two 10rd magazines and a locking device.