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This is the magazine that started it all. When Mossberg launched the 590M platform, they didn't just add a magazine to their legendary pump-action shotgun—they rethought the entire magazine experience for 12-gauge shotguns. The 10-round capacity gives you real versatility without the length penalty of traditional single-stack designs.
The patented double-stack architecture is the real story here. Instead of stacking rounds in a single column, this magazine arranges them in two columns, which means you get 10 rounds in a much shorter package. That matters more than it sounds. The compact length keeps the gun better balanced and easier to maneuver compared to longer magazine designs. Weight sits closer to the receiver where it belongs, not hanging down in front like a pendulum.
Mossberg didn't cut corners on construction. The polymer magazine body uses a proprietary self-lubricating material that handles repeated loading cycles without getting sticky or gummed up. Feed lips are hardened steel—not polymer—so they hold their shape through years of use. The over-molded shell ramps guide rounds smoothly into the chamber, while the heavy-duty ASTM-A-228 music-wire spring delivers consistent pressure across the entire capacity range. That's the kind of engineering detail that separates magazines that work from magazines that might jam when you need them most.
The removable floor plate makes cleaning straightforward—just pop it off and you've got full access to the magazine internals. The black oxide finish on all steel components resists corrosion, and the anti-cant rounded follower keeps rounds aligned for reliable feeding even when you're running the gun hard. This magazine works with 2.75-inch shells only, and it's designed exclusively for Mossberg 590M and 590RM mag-fed pump-action shotguns.
No. This magazine is designed exclusively for 2.75-inch shotshells only. Using 3-inch magnum shells will cause feeding problems and potential damage to the magazine. Stick with standard 2.75-inch shells for reliable operation.
The spring is stout and gets progressively tighter as you approach full capacity. Loading the last round or two requires firm pressure, but this is by design—it ensures rounds stay securely in place. Most people find that after a few magazine loadings, the process becomes smooth and natural.
No. The 590M magazine features integral stabilizing ribs that lock into notches engineered specifically into the 590M and 590RM receiver. These ribs won't work with other Mossberg shotgun models. It's designed exclusively for mag-fed 590M and 590RM pump-action shotguns.
The double-stack arrangement lets you fit 10 rounds into a significantly shorter package than a single-stack design would require. This keeps the magazine length from extending below the shotgun, which improves your ability to swing and control the gun. The weight also sits closer to the receiver, right at the balance point, rather than creating a pendulum effect downrange.
| UPC | 015813951388 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 95138 |
| Brand Fit | Mossberg |
| Caliber/Gauge | 12 Gauge |
| Capacity | 10 |
| Color | Black |
| Length | 8.5 |
| Model | |
| Model Fit | 590M |
| Package Height | 3.0 |
| Package Width | 4.5 |
| Product Type | Magazine |
| Shipping Weight | 1.42 |
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