The SLP and SLP Mark I represent the ultimate in shotgun performance for patrol duty, dynamic entry and personal defense. All SLP models offer 3" chambers chrome-lined bore and interchangeable choke systems. The SLP Standard features an 18" barrel, a MIL-STD 1913 top rail with adjustable ghost ring rear sight and a high-profile protected front sight. The SLP Mark I offers a 22" barrel with Weaver-pattern cantilever scope base, adjustable folding rear sight and a red fiber-optic front sight. The SLP Mark I is also available in a rifled barrel model for optimal accuracy with slugs. SLP Tactical models offer a pistol grip stock with interchangeable combs.am deployment and general law enforcement patrol.