Mossberg introduces the new 590R and 590RM (Mag Fed) 12-gauge shotguns with Rotary Safety Selector and AR-style ergonomics. New ground-breaking features include a redesigned user-serviceable forend; integrated barrel/single heat shield; and ambidextrous, rotary safety selector. Four models are available, including two standard offerings and two mag-fed versions, utilizing the first production double-stack magazines for pump-action shotguns.