Mossberg 590RM 12 Gauge Pump Shotgun, 18.5-Inch Barrel

The Mossberg 590RM is a 12 Gauge pump-action shotgun chambered for 2.75-inch shells. It features an 18.5-inch barrel with an integrated heat shield, Magpul MBUS 3 adjustable sights, and a 5-position adjustable synthetic stock. A top Picatinny rail and detachable magazine system support a configurable setup for security-oriented use.

Key Specifications

• This shotgun uses a pump-action operating system.
• The chamber accepts 2.75-inch shells.
• The barrel measures 18.5 inches and includes an integrated heat shield.
• The firearm is chambered in 12 Gauge.
• The finish is specified as parkerized.
• The stock is made from synthetic material and has a 5-position adjustable length of pull.
• The sight system consists of Magpul MBUS 3 adjustable sights.
• The shotgun includes a cylinder-bore choke through the Accu-Choke system.
• The receiver includes a top Picatinny rail for compatible accessories.
• The package includes one 10-round detachable magazine.

With its adjustable stock, compact barrel, integrated heat shield, and practical sighting system, the 590RM provides a well-equipped platform for owners seeking a configurable 12 Gauge pump-action shotgun. The Magpul MOE pistol grip, flat-profile trigger, recoil pad, and rotary safety selector add useful handling features without unnecessary complexity.