Mossberg 50794 590A1 Pro 12 Gauge 6+1 18.50" Silver Marinecote Silver Barrel & Receiver, Black Synthetic Stock

The Mossberg 590A1 Pro is a purpose-built 12 gauge pump-action shotgun designed for serious defensive work, duty use, and tactical applications. This model pairs proven reliability with modern features: a heavy-walled barrel in Marinecote finish resists corrosion in wet and humid conditions, while the silver receiver gets the same corrosion-resistant treatment. The 6+1 capacity (six rounds in the tube plus one in the chamber) and 18.50" barrel give you quick target acquisition without sacrificing magazine volume—a real advantage in close-quarters scenarios where pump shotguns excel.

Mossberg built this gun with agencies and professionals in mind. Dual extractors and steel-to-steel lockup ensure reliability under stress, while the twin action bars and anti-jam elevator keep the gun running when it matters. The heavy-walled construction isn't just for show; it's engineered to handle hard use, regular cleaning, and the occasional neglect that real-world carry brings. The top-mounted ambidextrous safety lets you work the gun from either shoulder without hunting for controls.

The 590A1 Pro ships with metal ghost-ring sights (rear) and a front fiber-optic sight—a proven combination for faster target acquisition than plain iron sights. The receiver is optic-ready with a plate that removes to accept micro dot sights (RMSc footprint), so you can upgrade to a red dot if your mission demands it. The black synthetic Magpul SGA adjustable stock with spacers fits shooters with different length-of-pull needs (adjusts 12.25–14.25 inches), and the clean-out magazine tube design prevents fouling. Metal trigger guard and safety button add durability where contact happens most.

Whether you're setting up a duty gun, a home-defense shotgun, or a range workhorse, the Mossberg 590A1 Pro delivers the kind of no-nonsense performance that's made the 590 platform a favorite among professionals and serious civilians for decades.

Key Features

• Heavy-walled barrel and receiver in Marinecote finish for superior corrosion resistance
• Dual extractors and steel-to-steel lockup for reliable cycling under stress
• Top-mounted ambidextrous safety operable from either shoulder
• Metal ghost-ring rear sight with front fiber-optic sight for faster target acquisition
• Optic-ready receiver accepts micro dot sights (RMSc footprint) with plate removal
• 6+1 round capacity with clean-out magazine tube design
• Twin action bars and anti-jam elevator prevent feeding failures
• Magpul SGA adjustable stock with spacers; length of pull adjustable from 12.25 to 14.25 inches
• 18.50" barrel for close-quarters speed without sacrificing capacity

Specifications

Frequently Asked Questions

Can I mount a red dot or optic on the 590A1 Pro?

Yes. The receiver is optic-ready and includes a mounting plate. Remove the plate to mount a micro dot sight in the RMSc footprint. The iron sights stay accessible as a backup.

What's included in the box?

The shotgun ships with metal ghost-ring rear and front fiber-optic sights installed, and the Magpul SGA adjustable stock with spacers. No additional accessories are mentioned as included.

Does the Marinecote finish really resist corrosion?

Marinecote is a nickel-teflon plating designed to perform in wet and humid environments. It's more corrosion-resistant than standard bluing, making it a solid choice for duty, home defense, or use in challenging weather.

Is the 590A1 Pro suitable for 3-inch magnum loads?

The shotgun has a 3-inch chamber, so yes, it will handle 3-inch loads. The heavy-walled barrel is designed to handle the pressures of duty ammunition and standard hunting loads.