Mossberg 590A1 Pro 12 Gauge 18.5in Magpul SGA 6+1

The Mossberg 590A1 Pro is a 12 gauge pump-action shotgun built for duty-style and defensive applications. It comes with an 18.50-inch heavy-walled barrel finished in Marinecote and fitted with a Magpul SGA adjustable synthetic stock. The receiver is optic-ready with an RMSc footprint and ships with a metal ghost-ring rear sight and a fiber-optic front sight. The design accepts up to 3-inch shells and provides a 6+1 capacity for operational flexibility.

Key Specifications

• The gauge is 12 Gauge.
• The action type is a pump-action configuration.
• The barrel measures 18.50 inches and is heavy-walled.
• The shotgun accommodates shells up to 3 inches in chamber length.
• The magazine capacity is 6+1.
• The exterior features a Marinecote finish for corrosion resistance.
• The stock is a Black Magpul SGA adjustable synthetic unit with spacers for length-of-pull adjustment.
• The sighting system is a ghost-ring rear and fiber-optic front sight setup.
• The receiver is optic-ready and accepts micro red-dot footprints including RMSc.
• The overall length is 38.5 inches.

Engineered for reliability in demanding environments, the 590A1 Pro pairs corrosion-resistant finishes and robust components with an adjustable Magpul SGA stock to provide a practical, duty-capable platform. Its optic-ready receiver and straightforward pump-action operation make it a durable choice for professionals and informed owners who want proven performance and adaptable ergonomics.