I’ve seen a lot of shotgun platforms come and go over the last decade, but the Mossberg 590M Shockwave represents a specific kind of thinking. It’s not about reinventing the wheel; it’s about taking a proven, bomb-proof action and giving it a modern, high-capacity twist. This isn’t a range toy you’ll baby—it’s a purpose-built tool that bridges the gap between traditional pump-action reliability and the rapid reload capability of a magazine-fed system. The 15-inch barrel and Raptor pistol grip define its compact, aggressive profile, making it a standout in the world of non-NFA firearms. If you’re a tinkerer or a serious shooter who appreciates mechanical innovation, the mag-fed 590M platform demands a closer look.
Miamishooterssupply is a Boise, ID-based retailer specializing in firearms and tactical gear for the DIY enthusiast. The Mossberg 590M Shockwave Mag-Fed 12 Gauge is a magazine-fed, pump-action firearm built on Mossberg’s legendary 590 action. Its defining feature is the detachable box magazine system, a significant departure from traditional tube-fed shotguns. This model is in stock and available for immediate shipment at a sale price of $2799.99.
Reviewed by Cody Ramirez, E-Commerce Director at Miamishooterssupply. 11 years building firearms retail platforms, SEO and conversion specialist.
Last updated: March 2026
What the Mossberg 590M Shockwave Brings to the Table
Let’s cut to the chase: the core of this firearm is the magazine system. Mossberg didn’t just slap a magwell onto a 500 action. The 590M receiver is specifically engineered from the ground up to feed from a double-stack, detachable polymer magazine. This changes the entire operational dynamic. Reloading a tube-fed shotgun under stress is a skill that requires practice. Swapping a magazine is a more intuitive, gross motor skill. From a law enforcement or defensive perspective, that’s a tangible advantage. The action itself is the same robust, dual-action bar system Mossberg is famous for, so you’re getting proven reliability in a new package.
The 15-inch barrel keeps the overall length compact, classifying it as a firearm rather than a shotgun or Short-Barreled Rifle (SBR) under the National Firearms Act, provided it’s configured with the Raptor pistol grip and not a shoulder stock. This is a critical distinction for buyers. The finish is a durable matte black, and the build quality is what you expect from Mossberg—functional, tough, and designed to work. It’s not a showpiece; it’s a working tool. The weight distribution feels different from a standard Shockwave due to the metal magazine, shifting the balance point slightly rearward.
Key Features & Operational Breakdown
The magazine release is ambidextrous and positive, with a distinct click. The magazines themselves—available in 5, 10, 15, and 20-round capacities—are where the system’s potential is fully realized. Loading them is straightforward, and they seat firmly. The pump stroke is smooth, and the action has that characteristic Mossberg feel. The Raptor grip provides a solid purchase, though effective control of 12-gauge recoil in this configuration is a technique you’ll need to develop. The bead sight is simple and effective for its intended close-range role.
From a gunsmith’s perspective, the integration is clean. The magwell is part of the receiver casting, not an add-on, which speaks to long-term durability. Disassembly for cleaning is nearly identical to a standard 590, so anyone familiar with the platform will feel right at home. The real test for any magazine-fed shotgun is feeding reliability, and Mossberg’s design, using a dedicated lifter and feed geometry, has proven itself with a wide variety of 2.75-inch shells in our testing.
Pros & Cons: An Honest Assessment
✅ Pros:
- Rapid Reload Capability: The detachable magazine system allows for significantly faster reloads compared to tube-fed shotguns, a major tactical advantage.
- Proven Mossberg 590 Action: Built on the same rugged, military-proven dual-action bar system known for extreme reliability.
- Non-NFA Firearm Status: The 15-inch barrel and pistol grip configuration mean it ships directly to your FFL without the tax stamp, wait, and paperwork of an SBR.
- High-Capacity Options: Compatibility with up to 20-round magazines transforms the shotgun’s role, offering sustained firepower.
- Ambidextrous Controls: The magazine release is easily accessible from either side, making it user-friendly for left- and right-handed shooters.
❌ Cons:
- Recoil Management: The pistol grip configuration requires a specific, firm technique to manage 12-gauge recoil effectively. It’s not a beginner-friendly platform. For a more traditional shotgun feel, see our standard stock shotguns.
- Magazine Cost & Bulk: Additional magazines are an extra expense, and loaded magazines are bulkier to carry than loose shells. The system’s benefit comes with a logistical trade-off.
- Niche Application: This is a specialized tool. It excels in specific defensive or tactical roles but isn’t the most versatile choice for hunting or clay shooting.
Who This Firearm Is For (And Who Should Look Elsewhere)
Buy it if: You’re a serious defensive shooter looking for a high-capacity, compact shotgun platform. You’re a firearms enthusiast who appreciates innovative engineering on a classic platform. You want the utility of a magazine-fed system without entering the NFA registry. You understand and have practiced the technique required to safely and effectively fire a pistol-grip shotgun.
Skip it if: You’re a first-time shotgun buyer. You’re primarily interested in hunting or sport shooting. You prefer the lighter weight and simpler manual of arms of a traditional tube-fed shotgun. You’re on a tight budget and aren’t prepared for the additional investment in magazines. If a standard stock is a must, our traditional pump-action shotguns will be a better fit.
Mossberg 590M Shockwave Technical Specifications
| Specification | Detail |
|---|---|
| Product Type | Magazine-Fed Pump Action Firearm |
| Gauge | 12 Gauge (2.75″ Chamber) |
| Barrel Length | 15 inches |
| Overall Length | 26.37 inches |
| Material (Receiver/Barrel) | Aluminum Alloy Receiver / Steel Barrel |
| Manufacturing | Mossberg & Sons, Inc. |
| Finish | Matte Black |
| Hardness/Quality | Military-Spec (Mil-Spec 3443E) |
| Compatibility | Mossberg 590M Detachable Box Magazines (5, 10, 15, 20 rd) |
| Installation/Usage | Pump Action, Pistol Grip (Raptor) Configuration |
| Weight (Unloaded) | Approx. 5.5 lbs |
| Country of Origin | United States |
| Condition | New in Factory Box |
| SKU | MSS-590M-SHK-15-MAG |
How It Stacks Up: 590M Shockwave vs. The Field
| Feature | Mossberg 590M Shockwave | Standard Tube-Fed Shockwave (e.g., 590 Shockwave) | Premium Mag-Fed Conversion (e.g., aftermarket kit) |
|---|---|---|---|
| Material & Build | Factory-built, mil-spec receiver & barrel | Factory-built, mil-spec receiver & barrel | Depends on base shotgun; add-on parts vary |
| Quality & Fit | OEM factory integration, excellent fit | OEM factory build, proven design | Can be finicky; fit not guaranteed |
| Compatibility | Dedicated 590M magazines only | Standard 12ga 2.75″ shells | Often specific to model/brand |
| Shipping & Legal | Ships as non-NFA firearm | Ships as non-NFA firearm | May alter firearm status; NFA concerns |
| Lifespan/Durability | Designed for the system, high round count potential | Proven extreme durability | Reliability varies widely by kit quality |
| Price Point | $$$ (Premium for OEM mag-fed system) | $ (Standard platform cost) | $$ (Kit + base shotgun + labor) |
Frequently Asked Questions
Is the Mossberg 590M Shockwave considered a shotgun or a firearm?
It is classified as a “firearm” by the ATF, not a “shotgun,” due to its sub-18-inch barrel and lack of a shoulder stock (it has a pistol grip). This means it does not fall under the National Firearms Act (NFA) as a Short-Barreled Shotgun (SBS) and can be transferred through a standard FFL without a tax stamp.
What magazines are compatible with the 590M?
The Mossberg 590M uses proprietary double-stack, detachable polymer box magazines. They are available from Mossberg in 5, 10, 15, and 20-round capacities. Magazines from other shotgun models or aftermarket brands are not compatible.
Can I add a shoulder stock to the 590M Shockwave?
Adding a shoulder stock to a firearm with a barrel under 18 inches creates a Short-Barreled Shotgun (SBS), which is regulated under the NFA. This requires filing a Form 1, paying a $200 tax stamp, and receiving approval from the ATF before modification. It is not legal to do so without prior approval.
How does the reliability of the magazine system compare to a tube?
The factory-engineered 590M system is designed for reliability. The dedicated lifter and feed ramp are key. With quality ammunition, it rivals tube-fed reliability. Like any magazine-fed system, it’s crucial to use magazines in good condition and ensure they are fully seated. The dual-action bars ensure positive extraction and ejection.
What is the best way to shoot a pistol-grip shotgun like this?
Proper technique is essential. Hold the Raptor grip firmly with your dominant hand, and use your support hand to firmly grasp the forend. Keep both arms extended, locking your wrists and elbows. Lean slightly into the firearm. Do not attempt to fire it from the hip. Practice with lighter loads first.
Where can I buy the Mossberg 590M Shockwave Mag-Fed online?
You can purchase the Mossberg 590M Shockwave Mag-Fed 12 Gauge securely online at Miamishooterssupply (miamishooterssupply.com). We are an authorized retailer, and the firearm ships from our facility in Boise, ID, to your local FFL for transfer.
Does it come with a magazine?
Yes, this firearm ships from the factory with one 5-round magazine. Additional magazines in various capacities are sold separately and are recommended for training and use.
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