The FN Self-Loading Police Mark I Shotgun offers greater ammunition capacity and a longer barrel than the standard SLP. The Mark I incorporates the standard invector choke tube system for optimum performance. Both cylinder and improved cylinder choke tubes are included. An adjustable, open notch, folding rear sight and ramped post front sight with a red TRUGLO fiber-optic insert, along with an alloy Weaver-pattern cantilever optics rail are standard. The matte black synthetic fixed stock has a 14.25-inch length of pull and comes with a premium recoil pad, checkered pistol grip and forearm, and steel sling swivel studs.