Mossberg 590RM 12 Gauge Pump Shotgun, 18.5 in. Barrel

The Mossberg 590RM is a 12 gauge pump-action shotgun configured with an 18.5-inch stand-off barrel and integrated heat shield. Its adjustable synthetic stock, pistol grip, Picatinny rail, and black finish group support adaptable handling for security and general sporting applications.

Key Specifications

• This shotgun uses a 12 gauge chambering.
• The action is pump-action for manual cycling.
• The barrel measures 18.5 inches in length.
• The maximum chamber size is 2.75 inches.
• The stand-off barrel incorporates an integrated heat shield.
• The shotgun has a cylinder bore choke configuration.
• The stock is a five-position adjustable synthetic stock.
• The furniture is finished in black.
• The receiver includes a Picatinny rail for compatible accessories.
• The design includes a Magpul MOE pistol grip.

With its adjustable stock, compact 18.5-inch barrel, integrated heat shield, and accessory-ready rail, the 590RM provides a practical platform for owners who value configurable fit and straightforward pump-action operation.