Mossberg 590s Moss 51605 590s 12 18.5 9+1 Tactical Cobfnd

Mossberg 590S Tactical Shotgun - 12 Gauge, 18.5" Barrel, 9+1 Capacity, Model 51605

Mossberg
SKU:
120919788
|
UPC:
015813516051
|
MPN:
51605
$589.98
$742.00
(You save $152.02 )
Current Stock:
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Product Specifications
Capacity-Rounds:
9
Caliber-Gauge:
12 Gauge
Hand:
Right Hand
Barrel Length:
18.5"
Barrel Length Range:
18" to 18.99"
Receiver Description:
Optics Cut
Chamber:
3"
Action:
Pump
Safety:
Ambidextrous Top Tang
Stock Finish Group:
Black
Sights:
Bead Front
Chokes Included:
Cylinder Bore
Product Overview

The Mossberg 590S Tactical Shotgun is a 12-gauge pump-action built for shooters who need real versatility in a fighting shotgun. With an 18.5" barrel and 9+1 capacity, it's short enough for tight spaces—vehicle, home defense, or tactical training—while delivering the reliability Mossberg's 590 line is known for. What sets the 590S apart from other tactical shotguns is its ability to cycle 1.75", 2.75", and 3" shells without modification: load any mix of shell lengths and the gun handles them all without adapters or fiddling. That flexibility means you can match your ammo to your mission without buying a different shotgun.

The receiver comes factory-cut to mount Shield RMSc-pattern micro dot sights directly to the top—a genuine modern-duty feature that improves sight picture and target acquisition. If you're not running a red dot yet, Mossberg includes a coverplate to keep the mounting area clean. You get pump-action fundamentals that work: dual extractors, twin action bars, positive steel-to-steel lockup, and an anti-jam elevator. The top-mounted ambidextrous safety puts control where you need it, and the cleanout magazine tube design lets you clear obstructions in the field without breaking the gun down.

Whether you're building a home-defense setup, running tactical courses, or hunting upland game, the 590S gives you a single shotgun that adapts to the job instead of forcing you to adapt to the gun. That's the appeal: one shotgun, multiple shell options, multiple missions, zero excuses.

Key Features

  • Cycles 1.75", 2.75", and 3" shotshells without adapters or adjustments
  • Load any combination of shell lengths simultaneously
  • Optic-ready receiver with Shield RMSc-pattern cuts for direct-mount micro red dots
  • Coverplate included for unmounted optic cutout
  • Dual extractors and twin action bars for reliable cycling
  • Positive steel-to-steel lockup and anti-jam elevator
  • Top-mounted ambidextrous safety
  • Convenient cleanout magazine tube design
  • 18.5" barrel for tactical maneuverability
  • 9+1 round capacity

Specifications

Gauge12
ActionPump/Slide
Barrel Length18.5"
Capacity9+1
Shell Compatibility1.75", 2.75", 3" (all without adapter)
Optic MountShield RMSc-pattern (receiver-cut)
Model Number51605

Frequently Asked Questions

Can the 590S really shoot different length shotshells without an adapter?

Yes. The 590S features a redesigned elevator, bolt slide, and energy-absorbing bumper that allow it to cycle 1.75", 2.75", and 3" shells right out of the box—no adapters, no modifications. You can load all three lengths in the same magazine tube and the shotgun will cycle them reliably.

What kind of red dot sight can I mount on the 590S?

The receiver is cut to accept low-profile red dots that follow the Shield RMSc pattern for direct mounting. A coverplate is included if you're not running an optic mounted on those cuts.

Is this shotgun suitable for home defense or tactical use?

The 18.5" barrel and 9+1 capacity make it well-suited for home defense and tactical applications. The top-mounted ambidextrous safety and reliable pump action are foundational for both roles, and the receiver cuts allow you to add modern optics for faster target acquisition.

What's included with the Mossberg 590S?

The shotgun comes with the coverplate for the optic-ready receiver. Specific items and accessories beyond that are not detailed in the product information available.

Additional Information

Firearm Shipments:

To buy rifles or shotguns, you must be 18 years old, and for handguns, actions, or receivers, the minimum age is 21. By placing an order for this firearm, you confirm that you are the legitimate transferee/buyer, meet the legal age requirements, and comply with all Federal, State, and local laws and regulations necessary to purchase this firearm.

We only ship firearms to valid Federal Firearms License (FFL) holders. At checkout we provide a FFL locator for your convenience.

We will need a copy of the FFL’s license to facilitate the process, kindly request your dealer to email us a copy of their FFL, as we cannot dispatch the firearm until we receive this document. It is imperative for the buyer to choose their FFL dealer, ensure they are willing to facilitate the transfer, and have them email their FFL copy to BOSQUE Outdoors. To avoid any confusion, the customer's name or order number must be mentioned in the email containing the FFL.

Email: [email protected]

  • Prior to placing an order, it is the buyer's responsibility to understand and adhere to their state's firearm regulations.
  • The buyer should verify with their receiving dealer that the chosen firearm is legally permissible in their state.
  • The buyer is accountable for any transfer fees or background check charges imposed by the receiving dealer. If the designated dealer declines to accept the firearm delivery, the buyer assumes responsibility for shipping costs to retrieve the firearm and resend it to an accommodating dealer.
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