The FN 509 is built on the proven architecture of the FNS Compact. Featuring a cold hammer-forged stainless steel barrel; combat-style sights; front and rear cocking serrations; MIL-STD 1913 accessory mounting rail; interchangeable backstraps; double action operation; fully ambidextrous slide stop lever and magazine release; fixed 3 dot luminescent sights and a polymer construction with replaceable steel frame/slide rails. Includes two interchangeable backstraps, two magazines, owners manual, locking device and soft pistol case.