FN 66-100722: The FN 509 MRD full size pistol equipped with the patented Low Profile Optics Mounting System for users who want a full-sized duty-style pistol for personal or home defense. The pistol is chambered in 9mm and features a 4.50\" cold hammer-forged barrel featuring the FN 509 signature recessed target crown to protect rifling, maintain accuracy and performance throughout the lifespan of the pistol. The slide and frame offer a secure grip and reduced recoil. Includes FN logo soft case, two 17rd magazines, three interchangeable backstraps, four MRD mounting plates, owners manual and gun lock.