Mossberg 51609 590S 12 Gauge Pump 3" 10+1 18.50" Matte Blued Heavy Walled Barrel, Drilled & Tapped Black Receiver, Fixed Black Synthetic Stock
$606.05
The Mossberg 590S is a 12-gauge pump-action shotgun built for shooters who need real versatility in the field or on the range. Unlike most shotguns locked into a single shell length, the 590S cycles 1.75", 2.75", and 3" shells interchangeably—no adapters, no fiddling, just load what works for your mission. That flexibility makes it equally at home in home defense, sport shooting, or training scenarios where you want to switch loads without breaking down the gun.
This model features the proven Mossberg pump reliability: dual extractors, twin action bars, and positive steel-to-steel lockup keep the action running smooth through thousands of rounds. The 18.5" heavy-walled barrel cuts down on recoil impulse and handles the rigors of repeated cycling. A redesigned elevator, bolt slide, and energy-absorbing bumper reduce wear and keep the gun running reliably. The receiver is drilled and tapped for optics mounting (Shield RMSc footprint), giving you a modern aiming solution without gunsmithing. The top-mounted ambidextrous safety is within quick reach from either shooting hand.
Ergonomics matter in a shotgun, and Mossberg addressed that with an adjustable length of pull (12" to 13") and a synthetic black stock with spacer—it'll fit shooters across different builds without custom fitting. The 10+1 capacity (nine in the magazine tube, one in the chamber) provides plenty of firepower without the weight penalty of longer tubes. The Accu-Choke system with a cylinder bore choke installed gives you room to optimize the pattern for your loads and distances down the road.
Key Features
- Cycles 1.75", 2.75", and 3" shells interchangeably—no mini shell adapter needed
- Optic-ready receiver (Shield RMSc footprint) drilled and tapped for modern sights
- Dual extractors and twin action bars for reliable operation across varying ammunition
- Adjustable length of pull (12"–13") with synthetic stock and spacer for proper fit
- 18.5" heavy-walled barrel for reduced recoil and durability
- Ambidextrous safety accessible from both sides
- Accu-Choke system with cylinder bore choke installed
- 10+1 capacity (9+1 magazine, 1 chamber)
Specifications
| Gauge | 12 |
| Action Type | Pump-Action |
| Chamber Size | 3" |
| Barrel Length | 18.5" |
| Barrel Type | Heavy-Walled |
| Barrel Finish | Matte Blue |
| Stock | Synthetic (Black) with Spacer |
| Length of Pull (Adjustable) | 12"–13" |
| Overall Length | 37.75" |
| Capacity | 10+1 (9 magazine, 1 chamber) |
| Weight | 6.75 lbs |
| Choke System | Accu-Choke (Cylinder Bore installed) |
| Sights | Bead; Optic-Ready (Shield RMSc footprint) |
| Safety | Top-Mounted Ambidextrous |
Frequently Asked Questions
Can I shoot different shell lengths in the same magazine without an adapter?
Yes—that's the defining feature of the 590S. Load 1.75", 2.75", and 3" shells in any combination without a mini shell adapter. The elevator and feed system handle all three lengths interchangeably, so you can tailor your load to the task at hand without reloading the magazine.
Will this shotgun accept optics, and what mounting system does it use?
Yes. The receiver is drilled and tapped for Shield RMSc footprint red dot sights. It's ready for mounting straight out of the box, and the integrated bead sight provides a backup aiming point.
Is the length of pull adjustable for smaller shooters?
Yes. The 590S features an adjustable length of pull from 12" to 13" and includes a spacer for fine-tuning fit. This lets you dial in proper gun mount and control across different shooter sizes without aftermarket modifications.
What's included with the Accu-Choke system?
The shotgun ships with a cylinder bore choke installed in the barrel. The Accu-Choke system allows you to swap chokes if you want to adjust the shot pattern for different loads and distances in the future.
