The FN SLP (Self-Loading Police) shotgun is a semi-automatic 12-gauge shotgun designed and manufactured by FN Herstal in Belgium. The SLP shotgun is gas-operated, and FN currently produces it in four different models: SLP Standard, SLP Mark I, SLP Tactical, and SLP Mark I Tactical. The SLP series was introduced in 2008, and was named "2009 Shotgun of the Year" by American Rifleman magazine.