MOSSBERG 590A1 - 12 GA - 3" - 20" - 8+1 - BLACK - MS51660

MOSSBERG 590A1 - 12 GA - 3" - 20" - 8+1 - BLACK - MS51660

Mossberg
MPN:
51660
UPC:
015813516600
$716.69 - $817.69
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Description

The Mossberg 590A1 12 Gauge Pump-Action Shotgun (Model MS51660) is the gold standard in tactical shotguns, purpose-built to exceed U.S. military MilSpec 3443E requirements and trusted by armed forces and law enforcement agencies around the globe. With an 8+1 capacity and a rugged 20" barrel, this is a serious tool engineered for serious work.

  • MilSpec 3443E certified — battle-proven by U.S. military qualification testing
  • Heavy-walled 20" barrel delivers durability and consistent 12-gauge performance
  • Dual extractors ensure reliable shell extraction in all conditions
  • Twin action bars eliminate binding for smooth, positive cycling every time
  • Top-mounted ambidextrous safety for intuitive operation under stress
  • 8+1 round capacity maximizes firepower in a tactical-length platform

Who This Is For

The Mossberg 590A1 is built for serious shooters who demand proven reliability — whether you're in law enforcement, military service, or a civilian who refuses to compromise on home defense. It's equally at home on a duty belt, a patrol vehicle rack, or secured inside your home for when it matters most. If you want the shotgun that the U.S. military chose after exhaustive testing, this is it.

Mossberg 590A1 12 Gauge Pump Shotgun - right side profile view Mossberg 590A1 MS51660 - receiver and action detail view

Specifications

ModelMS51660
ActionPump Action
Gauge12 Gauge
Chamber3"
Barrel Length20"
Capacity8+1
StockBlack Synthetic
FinishMatte Black
SafetyTop-Mounted Ambidextrous
Action BarsTwin (Anti-Bind)
ExtractorsDual
MilSpecMilSpec 3443E Certified
Overall LengthApprox. 41"
WeightApprox. 7.25 lbs
Country of OriginUSA

Frequently Asked Questions

What types of 12-gauge ammunition can the Mossberg 590A1 MS51660 reliably cycle?

The 590A1 is designed to feed a wide variety of 12-gauge ammunition, including 2¾" and 3" shells. It reliably cycles standard buckshot, slugs, and tactical loads. Because it is a manually operated pump-action, it is not sensitive to low-pressure or light target loads the way semi-automatic shotguns can be — making it an exceptionally versatile platform across a broad range of ammunition types.

How does the 590A1 differ from the standard Mossberg 500 or 590?

The 590A1 is Mossberg's heavy-duty, MilSpec-grade variant. Compared to the standard 500 and 590, the 590A1 features a thicker-walled, metal-magazine-tube construction, a heavier barrel, a metal trigger guard, and metal safety button — all upgrades that significantly increase durability under hard use. It passed the U.S. military's rigorous MilSpec 3443E testing, which the standard models are not submitted for. If reliability under extreme conditions is a priority, the 590A1 is the clear step up.

Is the Mossberg 590A1 a good choice for home defense?

Absolutely. The 590A1's 8+1 capacity, proven pump-action reliability, and ambidextrous top-mounted safety make it an excellent home defense shotgun. The 20" barrel provides a balance of maneuverability and ballistic performance. Its military and law enforcement pedigree means you're getting a platform that has been trusted in life-safety scenarios worldwide. Pair it with quality 12-gauge buckshot for a formidable defensive tool.

Additional Information
Caliber:
12 GA
Color:
Black
Barrel Length:
20"
Chamber:
3"
Sights:
Bead
Capacity:
8+1
Stock:
Fixed
Action:
Pump
Type of Barrel:
Heavy