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

Description

The Mossberg 590RM is a 12 gauge pump-action shotgun with an 18.5-inch barrel and a 2.75-inch chamber. This configuration combines adjustable MBUS 3 sights, an adjustable stock, and a detachable magazine system. A top Picatinny rail provides a mounting surface for compatible accessories.

Key Specifications

• The shotgun is chambered in 12 gauge for use with compatible 12 gauge ammunition.
• It uses a pump-action operating system with a familiar manual cycle.
• The barrel measures 18.5 inches and includes an integrated heat shield.
• The chamber accepts shells up to 2.75 inches in length.
• The sighting system consists of Magpul MBUS 3 adjustable sights for a configurable sight picture.
• The barrel uses a cylinder bore choke with the Accu-Choke system.
• The shotgun has a five-position adjustable stock for length-of-pull adjustment.
• The receiver is made from aircraft-grade aluminum for a lightweight receiver construction.
• The package includes one 10-round detachable magazine for feeding the shotgun.
• A top Picatinny rail provides an attachment point for compatible optics or accessories.

The adjustable stock and pistol grip give this shotgun a configurable interface, while the integrated heat shield follows the barrel profile. The cylinder bore choke is specified for this configuration, and the adjustable sights provide a ready-to-use sighting system without requiring an optic. We stock the 590RM for shooters who want a pump-action shotgun built around a detachable magazine and adjustable controls. Its defining combination is the 18.5-inch barrel, aluminum receiver, and configurable furniture.