FN 509M 9mm Luger 4in Matte Black Pistol - 15+1 Rounds - The FN 509M MRD featuring the FN Low Profile Optics Mounting System, gives you the option of direct mounting more than 10 different miniature red dot optics to your concealed carry pistol. Featuring a 4" slide and barrel; improved controls; flat faced trigger; fully ambidextrous controls; MIL-STD-1913 accessory mounting rail; cold hammer-forged steel barrel with a recessed target crown; Co-Witness iron sights and improved front and rear cocking serrations. Includes Holosun 407C red dot, two 15rd magazines, two backstraps, case, locking device and owners manual. *Compatible with FN 509 17rd and 24rd magazines.