The Mossberg 590M 12 Gauge 18.5″ Tungsten Gray with Magpul SGA and 10+1 capacity is the magazine-fed pump-action that finally marries the reliability of a Mossberg 500-series with the speed of detachable box magazines. This isn’t a retrofit or a gimmick—it’s a purpose-built platform from the factory, designed for shooters who want to clear malfunctions by swapping a mag instead of fishing for shells. The Tungsten Gray Cerakote barrel, drilled-and-tapped receiver, and orange safety-equipped Magpul SGA stock make this the most forward-thinking defensive shotgun on the market right now.
| Manufacturer | Mossberg |
|---|---|
| Model | 590M |
| Material | Steel barrel, polymer stock and receiver components |
| Compatibility | Mossberg 590M factory magazines (5, 10, 15, 20 round) |
| Finish | Tungsten Gray Cerakote on barrel; hard-anodized receiver (per manufacturer specs) |
| Weight | 7.5 lbs unloaded (per manufacturer specs) |
| Condition | New |
Key Features
- Factory Magazine-Fed Action — Why it matters: Reloads drop from 15 seconds to under 3 with a simple mag change. No tube-loading under stress.
- Magpul SGA Stock with Safety Orange Insert — Why it matters: The ergonomic rifle-style grip reduces muzzle climb and the bright insert gives instant visual confirmation of the safety status even in low light.
- 18.50″ Barrel with Fiber Optic Front Sight — Why it matters: Short enough for tight corners, long enough for slug accuracy out to 75 yards. The fiber optic grabs ambient light for faster front-sight focus.
- Drilled-and-Tapped Receiver — Why it matters: Mount a red dot, holographic, or scout scope without a gunsmith. The 590M accepts standard 500-pattern rail systems.
- Tungsten Gray Cerakote Finish — Why it matters: Corrosion-resistant, low-glare, and matches the modern two-tone aesthetic that dominates tactical shotguns right now.
Who It’s For
This shotgun is built for the tech-savvy shooter who already runs AR-platform rifles and wants a shotgun that operates with the same muscle memory—detachable mags, pistol grip, and optic-ready receiver. It’s also ideal for the early adopter who wants the fastest reloads in home defense without sacrificing the proven reliability of a pump action. If you’ve ever tried to fumble a shell into a tube under a timer, you already know why this platform exists.
Pros & Cons
- Pro: 10+1 capacity out of the box, with 15- and 20-round mags available. That’s more firepower than any tube-fed pump.
- Pro: The Magpul SGA stock has a LOP adjustment range of 12.25″–14.25″ without tools—fits shooters from 5’4″ to 6’4″.
- Con: The 590M magazines are proprietary and cost more than standard 500 tubes. Stock up on at least two spares to make the system worth it.
- Con: The Tungsten Gray Cerakote looks incredible, but it will show carbon buildup faster than a matte black finish.
Comparison: Mossberg 590M vs. Remington 870DM vs. Beretta 1301 Tactical
| Feature | Mossberg 590M | Remington 870DM | Beretta 1301 Tactical |
|---|---|---|---|
| Action | Pump-action | Pump-action | Gas-operated semi-auto |
| Capacity | 10+1 (magazine) | 6+1 (magazine) | 7+1 (tube) |
| Reload Speed | Fast (mag swap) | Fast (mag swap) | Fast (tube load) |
| Optic Ready | Yes (drilled & tapped) | Yes (drilled & tapped) | Yes (rail included) |
| Stock | Magpul SGA (adjustable) | Synthetic fixed | Mesa Tactical (adjustable) |
| Price | $784.84 | $650–$750 | $1,200–$1,400 |
The 590M beats the 870DM on capacity and stock adjustability, and it undercuts the Beretta 1301 on price by nearly $500 while still giving you an optic-ready, magazine-fed platform. If you want the fastest manual-action shotgun reloads in the game, this is it.
FAQ
What magazines does the Mossberg 590M use?
The 590M uses proprietary Mossberg 590M magazines. Factory options include 5, 10, 15, and 20-round capacities. Standard Mossberg 500/590 tube magazines will not fit.
Can I mount a red dot on the 590M?
Yes. The receiver is drilled and tapped from the factory, and it accepts standard Mossberg 500-pattern rail systems. No gunsmithing required—just bolt on a rail and mount your optic.
Is the 590M legal in my state?
Magazine capacity laws vary by state. The 590M ships with a 10-round magazine, but 15- and 20-round magazines are available. Check your local laws before purchasing high-capacity mags. We ship to all 50 states, but compliance is your responsibility.
Does the Magpul SGA stock fit standard Mossberg 500s?
No. The SGA stock on the 590M is specifically fitted for the 590M receiver and magazine system. It is not interchangeable with standard 500/590 stocks without modification.
Buy with Confidence
- ✅ Nationwide delivery (all 50 states)
- ✅ Ships 1-2 business days
- ✅ 30-day returns
- ✅ Secure checkout
Last updated: April 2026
Related categories: Pump Action Shotguns | Mossberg Shotguns | Tactical Shotguns
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