The Mossberg 590 Tactical M-LOK 12 Gauge 20in is a pump-action shotgun built for serious defensive and duty use, blending proven 590-series reliability with a modern M-LOK forend and ghost-ring sights. This 12-gauge workhorse chambers 3-inch shells, runs a 20-inch barrel, and ships with an Accu-Choke system and cylinder bore tube installed. It’s ready for optics, lights, and grips right out of the box.
| Manufacturer | Mossberg |
|---|---|
| Model | 590 Tactical M-LOK |
| Material | Synthetic stock, M-LOK aluminum forend (per manufacturer specs) |
| Compatibility | 12 Gauge, 2.75- and 3-inch shells |
| Finish | Matte blued barrel, parkerized receiver |
| Weight | 7.0 lbs (per manufacturer specs) |
| Condition | New |
Key Features
- M-LOK Forend — Directly attach lights, lasers, or vertical grips without adapter plates. Why it matters: You keep the forend slim and lightweight while getting modular accessory placement exactly where you need it.
- Ghost-Ring Sights — Rear aperture with a front post gives fast target acquisition and precise shot placement. Why it matters: In low-light or stress, ghost rings align your eye instantly compared to bead sights.
- Accu-Choke System — Interchangeable choke tubes let you tune pattern spread for home defense, slugs, or birdshot. Why it matters: One shotgun handles multiple roles without needing a barrel swap.
- Ambidextrous Safety — Top-tang safety is reachable by either thumb, even with gloves. Why it matters: No fumbling under recoil or stress—lefties and righties get the same fast access.
- 20-Inch Barrel & 6+1 Capacity — Compact enough for tight hallways, long enough for reliable slug accuracy. Why it matters: You get maximum maneuverability without sacrificing velocity or sight radius.
Who It’s For
This shotgun is for shooters who want a defensive pump gun that accepts modern accessories without gunsmithing. If you’re a tech-savvy owner who runs weapon lights, red dots, or forend grips, the M-LOK system saves you from buying a separate forend. It also fits LE/MIL duty users who need a proven action with corrosion-resistant internals and ambi controls.
Pros & Cons
- Pro: M-LOK forend is factory-installed, no aftermarket guesswork.
- Pro: Ghost-ring sights are metal and adjustable for windage.
- Pro: Dual extractors and anti-jam elevator reduce malfunctions.
- Con: Fixed synthetic stock limits LOP adjustment—tall shooters may want an aftermarket stock with spacers.
- Con: Accu-Choke requires periodic cleaning to prevent carbon lock.
Comparison
| Feature | Mossberg 590 Tactical M-LOK | Remington 870 Tac-14 | Benelli Supernova Tactical |
|---|---|---|---|
| Forend | M-LOK aluminum (factory) | Synthetic (no M-LOK) | Synthetic (no M-LOK) |
| Sights | Ghost ring (adjustable) | Bead sight | Ghost ring (adjustable) |
| Capacity | 6+1 (20in barrel) | 4+1 (14in barrel) | 5+1 (18in barrel) |
| Choke System | Accu-Choke (interchangeable) | Fixed choke (cylinder) | Crio (interchangeable) |
| Weight | 7.0 lbs | 5.6 lbs | 7.2 lbs |
| Price | $578.07 | $499.00 | $629.00 |
FAQ
Can I mount a red dot on the Mossberg 590 Tactical M-LOK?
Yes. The receiver is drilled and tapped for optics—add a Picatinny rail section or direct-mount a red dot with the correct footprint. The ghost-ring sights co-witness through most low-profile optics.
What accessories fit the M-LOK forend?
Any M-LOK-compatible accessory: lights (SureFire, Streamlight, Modlite), vertical grips, hand stops, and rail sections. The forend has three M-LOK slots per side at the 3, 6, and 9 o’clock positions.
Does this shotgun come with extra choke tubes?
It ships with one cylinder bore Accu-Choke tube installed. Additional tubes (improved cylinder, modified, full) are sold separately and are widely available.
Is the Mossberg 590 Tactical legal in all 50 states?
Yes. The 20-inch barrel and 6+1 capacity comply with federal and state laws for non-NFA shotguns. Check local magazine capacity restrictions if you live in a restricted state.
Ready to Upgrade Your Defensive Shotgun
The Mossberg 590 Tactical M-LOK 12 Gauge 20in gives you a factory-built platform that’s ready for lights, lasers, and optics—no drilling, no tapping, no adapter plates. At $578.07, it’s one of the most cost-effective ways to get a modern tactical pump gun with proven reliability. According to Mossberg specs, the 590 series is used by over 1,000 law enforcement agencies worldwide, and the M-LOK version brings that duty-grade toughness into the civilian market with modularity built in.
One honest drawback: the fixed stock limits length-of-pull adjustment. If you’re over 6’3” or plan to wear thick body armor, budget for an aftermarket stock with spacers. Otherwise, this shotgun runs flat out of the box.
✓ Nationwide delivery (all 50 states)
✓ Ships 1-2 business days
✓ 30-day returns
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Browse more: Pump Action Shotguns | Mossberg Shotguns | Tactical Shotguns
Last updated: April 2026
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