Description
The Mossberg Model 590A1 Tri-Rail 12 Ga 20″ Barrel Six-Position Adjustable Stock 8 Round is a purpose-built, mil-spec tactical shotgun. It’s engineered for durability and modularity, featuring a heavy-walled barrel, a robust tri-rail forend for mounting optics and lights, and an adjustable stock to fit any user. This is a serious tool for serious scenarios, with a price of $738.36.
Key Features
- Mil-Spec 590A1 Construction: Heavy-walled barrel, metal trigger guard, and metal safety for maximum durability under hard use.
- Integrated Tri-Rail Forend: Provides 12, 6, and 9 o’clock Picatinny rails for mounting weapon lights (like Streamlight TLR-1), lasers, and vertical grips without gunsmithing.
- Six-Position Adjustable Stock: Allows for precise length-of-pull adjustments from 11.5″ to 14.5″ to accommodate different body types and layers of gear.
- 8+1 Round Capacity: The 20″ barrel paired with the extended magazine tube offers a substantial onboard payload for defensive situations.
- Ambidextrous Top Safety: Easily accessible and operable with either hand, a hallmark of Mossberg’s practical design.
Specifications & Details
| Gauge | 12 Gauge (3″ Chamber) |
| Barrel Length | 20 Inches |
| Overall Length | 39.5″ – 42.5″ (Adjustable) |
| Capacity | 8+1 Rounds |
| Weight | Approx. 7.25 lbs |
| Stock | Six-Position Adjustable |
When it comes to home defense, you need a platform that’s ready to work. The 590A1’s heavy components and parkerized finish resist corrosion and wear. Its 20″ barrel provides a solid balance between maneuverability in tight spaces and sight radius. The action is smooth out of the box, and the dual extractors ensure reliable cycling. This model is mil-spec compatible, meaning parts and accessories designed for the military 590A1 will fit seamlessly. It ships to Missouri and compliant US states.
Who This Shotgun Is For
This is for the prepared citizen, the security professional, or the shooter who values over-engineering. It’s for someone who views a shotgun not as a collection piece but as a primary defensive tool that must function under stress. If your scenario involves low-light conditions, the tri-rail system is a necessity, not a luxury. It’s also an ideal platform for tactical training courses where durability and customization are key.
Pros & Cons
Pros: Unmatched mil-spec durability. The tri-rail system is genuinely useful and saves you from buying an aftermarket forend. The adjustable stock makes it a true fit for multiple users. Mossberg’s proven action and safety layout are intuitive under pressure. It’s a no-nonsense, ready-to-role workhorse.
Cons: At over 7 pounds unloaded, it’s not a lightweight. The tactical focus means it’s not suited for hunting or clays. The price point reflects its specialized build—you’re paying for capability, not frills. That said, the investment buys you a lifetime of service.
Frequently Asked Questions
Q: Can the stock be easily swapped for a pistol grip or a different style?
A: Yes. The receiver uses a standard Mossberg 500/590 stock mounting system, allowing you to change to a vast array of aftermarket stocks or pistol grips from brands like Magpul. It’s a drop-in ready process with basic tools.
Q: What is the actual benefit of the “mil-spec” 590A1 construction?
A: It means this shotgun meets the U.S. military’s specification (MIL-S-3443G) for durability. The heavier barrel walls resist bending, and the all-metal trigger group and safety are more resistant to impact and wear than polymer components found on commercial models. It’s built to survive harsh conditions.
Q: Is the forend compatible with standard Mossberg 500/590 accessories?
A: No, the tri-rail forend is specific to this model and replaces the standard action slide tube assembly. However, accessories that mount to Picatinny rails—like most modern weapon lights from SureFire or InForce—are universally compatible. FFL transfer required for firearm purchases.
Ready to configure a serious defensive tool? This Mossberg 590A1 Tri-Rail is available at firearms-missouri.com for Missouri residents and nationwide.
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