The SLP represent the ultimate in shotgun performance for personal defense. All SLP models offer 3" chambers and extended magazine tubes. The SLP model features an 18" barrel, a MIL-STD 1913 top rail with adjustable ghost ring rear sight and a high-profile protected front sight. The FN Self-Loading Police Shotgun (SLP) is a very compact, fast-cycling semi-automatic shotgun with a more traditional stock design. The 18" barrel and 6-shot magazine make it ideal for stowing in vehicles, boats and aircraft, for home security and for operations in close quarters by law enforcement.