The Mossberg 590RM is a 12 Gauge magazine-fed pump-action shotgun built on the 590 platform, using an 18.5" barrel, detachable 10-round box magazine, integrated heat shield & adjustable tactical stock. It is designed for security, range work & defensive shotgun roles, giving the classic pump gun a reload-speed upgrade without requiring anyone to master tube-loading gymnastics under stress. The 590RM keeps Mossberg’s well-earned reputation for rugged pump-action reliability, with dual extractors, steel-to-steel lockup, twin action bars & an anti-jam elevator for smooth operation. Its rotary safety, flat-profile trigger, Picatinny optics rail & Magpul MBUS 3 sights make it a serious modernized 590.