The Mossberg 590S Optic-Ready Threaded 12 gauge cycles 1.75-inch, 2.75-inch and 3-inch shells interchangeably, with no mini shell adapter required (Mossberg part no. 51609). An 18.5-inch heavy-walled barrel takes the Accu-Choke system with a cylinder bore choke installed. The receiver has a cut for Shield RMSc-footprint optics, and a compact stock with a spacer adjusts from 12 to 13 inches. A redesigned elevator, bolt slide and a new energy-absorbing bumper tune the action. For a flexible home-defense or range gun, this Mossberg loads whichever shell length fits the job.

Key Specifications

• Gauge is 12 gauge, the standard for home-defense and field shotguns.
• The chamber is 3 inches, and the action cycles 1.75-inch, 2.75-inch and 3-inch shells interchangeably.
• The barrel is 18.5 inches and heavy-walled, a compact length for maneuverability.
• The barrel is threaded for the Accu-Choke system, with a cylinder bore choke installed.
• The finish is matte blue, a durable low-glare coating.
• Capacity is listed at 5+1, 6+1 and 9+1 by the maker, so check the configuration you want.
• The receiver is optic-ready for the Shield RMSc footprint, so a micro dot mounts without an adapter plate.
• The stock is black synthetic with a spacer, adjusting from 12 to 13 inches length of pull.
• The safety is top-mounted and ambidextrous, easy to reach from either side.
• Sights are a bead front, fast for close-range work.

Frequently Asked Questions

Can the 590S handle different shell lengths? Yes. Mossberg says the 590S cycles 1.75-inch, 2.75-inch and 3-inch shells interchangeably, and you can load any combination at once.

What optic footprint does it use? It is optic-ready for the Shield RMSc footprint.

What choke is installed? The barrel takes the Accu-Choke system with a cylinder bore choke installed.

Buy the Mossberg 590S Optic-Ready Threaded 12 Gauge Pump Shotgun

Mixing shell lengths in the magazine is the trick that sets the 590S apart, and the optic cut and threaded barrel add modern options on top. Order it from our Lubbock, Texas gun shop for fast, insured shipping to your FFL, and see more pump-action shotguns too.