Mossberg 590RM 12 Gauge 18.5 in. Magpul MBUS 3

The Mossberg 590RM is a 12-gauge pump-action shotgun built on the 590 platform and configured for tactical and security use. It features an 18.5-inch barrel with an integrated single-piece heat shield and Magpul MBUS 3 adjustable flip-up sights for a compact, sighted configuration. The action accepts 2.75-inch shells and is fitted with a 5-position adjustable stock and Magpul MOE pistol grip for shooter fit and control. The receiver is aircraft-grade aluminum and is drilled and tapped to support optics and accessories.

Key Specifications

• The gauge is 12 Gauge.
• The action type is Pump-Action.
• The barrel measures 18.5 inches.
• The chamber accepts 2.75-inch shells.
• The barrel includes a single-piece heat shield.
• The sights are Magpul MBUS 3 adjustable flip-up sights.
• The stock is a 5-position adjustable stock with MOE pistol grip.
• The receiver is aircraft-grade aluminum and is drilled and tapped for optics.
• Includes a detachable magazine.
• Additional feature: flat-profile trigger.

The 590RM blends proven pump-action reliability with modular, duty-oriented features to serve in demanding security or tactical roles. Its compact 18.5-inch configuration, integrated heat shield and adjustable furniture make it a practical, adaptable platform for users who prioritize rugged construction and accessory readiness.