MossBerg 590S Optic Ready 12 Gauge 20" Pump Action Shotgun, 13-Round Capacity

The Mossberg 590S optic-ready 12 gauge pump-action shotgun brings genuine versatility to home defense, sport shooting, and tactical applications. Built on the proven Mossberg platform, the 590S stands out for one core feature: it cycles 1.75-inch short shells, 2.75-inch standard shells, and 3-inch magnum loads interchangeably—no adapters, no swapping out the magazine tube, no guesswork. Load whatever combination of shell lengths fits your mission, and the gun handles them all without adjustment. With a 13-round capacity, 20-inch barrel, and factory-ready optic mount, this is a modern fighting shotgun that doesn't ask you to compromise on ammunition flexibility or firepower.

The action speaks Mossberg reliability: dual extractors, twin action bars, and positive steel-to-steel lockup ensure smooth, snag-free cycling even under hard use. The redesigned elevator bolt, slide, and energy-absorbing bumper smooth out recoil and reduce wear. An ambidextrous safety keeps the gun accessible whether you're left- or right-handed, and the synthetic stock with M-Lok forend is purpose-built for mounting lights, grips, or slings. The matte blue finish on the barrel and receiver resists corrosion and shows a clean, business-like appearance.

Out of the box, the 590S wears a bead sight and ships with a Cylinder Bore Accu-Choke installed—you can swap chokes to tune patterns for your load. The optic-ready top rail accepts most common red-dot sights and magnified optics, letting you outfit it for the job at hand. At 7.25 pounds with a fixed 13.87-inch length of pull, it balances control and pointability. Whether you're running it for home defense, clay sports, or tactical training, the 590S gives you the flexibility to choose your shotshell without choosing a new shotgun.

Key Features

• Cycles 1.75", 2.75", and 3" shells interchangeably—load any mix without adapters or changes
• 13-round capacity for maximum firepower on demand
• Optic-ready receiver with factory-integrated rail for red-dot and scope mounting
• Dual extractors and twin action bars deliver smooth, reliable pump action
• Steel-to-steel lockup and redesigned elevator system for durability and reduced recoil
• Ambidextrous safety operable from either side of the trigger guard
• M-Lok forend accepts lights, slings, and tactical accessories
• Accu-Choke system with Cylinder Bore choke included; swappable for pattern tuning
• Synthetic stock and matte blue finish resist corrosion and reduce maintenance

Specifications

Frequently Asked Questions

What shell lengths does the 590S handle?

The 590S cycles 1.75-inch short shells, 2.75-inch standard loads, and 3-inch magnum shells—all in the same magazine tube, in any combination you load. No mini-shell adapters or magazine swaps required.

Can I mount a red-dot or rifle scope on this shotgun?

Yes. The 590S ships with a factory-integrated optic-ready rail on top of the receiver designed to accept standard red-dot sights, magnified optics, and other rail-mounted accessories.

What choke comes installed, and can I swap it?

A Cylinder Bore Accu-Choke is factory-installed. The Accu-Choke system allows you to change chokes to adjust your shot pattern for different loads and distances.

Is the safety ambidextrous?

Yes, the top-mounted safety is ambidextrous and operates from either side, making the shotgun equally ready for right- or left-handed shooters.