Mossberg 940 Pro Tactical SPX — 12 Gauge, 18.5 in Barrel
Video review
Expert review
About this product
The Mossberg 940 Pro Tactical SPX is a 12-gauge, semi-automatic shotgun featuring an 18.5-inch barrel, designed for duty, home defense, and tactical training, offering a 7+1 capacity and weighing 7.25 pounds unloaded.
Built with an optic-ready receiver, M-LOK forend with heat shield, and an included Holosun 407K micro-dot, it balances rugged reliability with modern accessory compatibility. Its adjustable stock and oversized controls make it adaptable for various shooter preferences and rapid operation under stress.
What is the Mossberg 940 Pro Tactical SPX used for?
This shotgun is engineered for tactical scenarios, including home defense, law enforcement duty, and intensive training drills.
Its 18.5-inch barrel keeps it maneuverable in close quarters, while the semi-automatic action allows for quick follow-up shots. The included Holosun 407K optic enables fast target acquisition, critical in high-stress situations where split seconds matter.
How does the Mossberg 940 Pro Tactical SPX compare to the Stevens 555 Sporting O/U 12 Gauge?
The Mossberg 940 Pro Tactical SPX outperforms the Stevens 555 Sporting O/U in rapid-fire applications due to its semi-automatic action versus the over-under's two-shot limit.
While the Stevens 555 excels in clay shooting with its 30-inch barrels and traditional handling, the Mossberg's 7+1 capacity and accessory rails make it superior for defensive use. The Mossberg cycles 2¾-inch to 3-inch shells reliably, whereas the Stevens is strictly a sporting tool.
What does it weigh and what are the dimensions?
The shotgun weighs 7.25 pounds unloaded and measures 39.5 inches in overall length with the stock fully extended.
Its 18.5-inch barrel contributes to a compact profile, and the length of pull is adjustable from 12.5 to 14.25 inches. The weight distribution favors front-heavy stability, reducing muzzle climb during rapid fire, a detail armorer’s appreciate for controlled shot strings.
Who is this NOT for?
This model is not ideal for hunters seeking lightweight field guns or beginners on a tight budget.
At over $1,100, it’s a significant investment compared to pump-action alternatives like the Mossberg 500. The tactical features add bulk unnecessary for bird hunting, and the semi-automatic mechanism requires more maintenance than a simpler bolt-action rifle for pure precision work.
What's in the box?
The package includes the Mossberg 940 Pro Tactical SPX shotgun, a Holosun 407K red dot sight, one cylinder bore choke tube, and a basic set of tools for optic mounting.
Mossberg ships it with the choke pre-installed and the optic unmounted, allowing users to torque to their preferred specifications. The box lacks additional chokes or a carrying case, so factor in $50–$100 for a dedicated soft case if transporting regularly.
Is the Mossberg 940 Pro Tactical SPX worth it at $1121.99?
At $1121.99, this shotgun justifies its price for serious users who need reliability and modern features out of the box.
The included Holosun 407K alone retails for around $240, making the firearm itself effectively sub-$900. For professionals or prepared civilians, the combination of rugged build, adjustable ergonomics, and optic readiness eliminates aftermarket spending, placing it ahead of custom-built alternatives that can exceed $1,500.
Specs at a glance
Pros & cons
What works
- Weighs 7.25 lbs — balanced for controlled rapid fire without excessive fatigue
- 18.5-inch barrel keeps overall length under 40 inches for tight spaces
- Includes Holosun 407K optic ($240 value) pre-mounted on optic-ready receiver
- Adjustable length of pull from 12.5 to 14.25 inches fits 95% of adult shooters
- M-LOK forend with integrated heat shield allows accessory mounting without burn risk
Trade-offs
- No included case or additional choke tubes — adds $50–$100 for proper storage and versatility
- Semi-auto gas system requires more frequent cleaning than pump actions — expect 30-minute detail strips after every 250 rounds
- Front-heavy balance may feel sluggish to shooters accustomed to lighter field guns like the Stevens 555
Key attributes
| upc | 015813851794 |
| manufacturer | Mossberg |
| manufacturer part number | 85179 |
| action | Semi-Auto |
| atf type | Shotgun |
| barrel length | 18.5" |
| caliber/gauge | 12 Gauge |
| capacity | 7 + 1 |
| chokes included | Cylinder Bore |
| color | Black |
| length | 46.3500 |
| model | 940 |
| package height | 3.5 |
| package width | 9.1 |
| product type | Shotgun |
| shipping weight | 10.5 |
| sights | Ghost Ring Sights |
| sights type | Adjustable Sights |
| state restriction (il) | NO SALE TO ILLINOIS PICA |
Frequently asked questions
- Is it compatible with aftermarket choke tubes?
- Yes, it uses Mossberg's Accu-Choke system, compatible with all standard Accu-Choke tubes (like Improved Cylinder or Full) which thread into the 18.5-inch barrel. These tubes typically cost $25–$40 each from Mossberg or Carlson's.
- Does it fit in a standard 40-inch rifle case?
- Yes, with the stock collapsed to 12.5 inches LOP, the overall length is roughly 36 inches, allowing it to fit in most 40-inch cases. I recommend a case with at least 2 inches of interior width to clear the optic and forend.
- How long does shipping take?
- Ironclad Armory processes orders within 1 business day, with ground shipping typically taking 3–5 days to most continental US locations. Expedited options are available for an additional fee, cutting transit to 2 days.
- Can I return it if it doesn't fit my needs?
- Ironclad Armory accepts returns within 30 days for unused, unfired items in original packaging, but firearms shipments require an FFL transfer; once transferred, returns are handled as warranty claims directly with Mossberg, which can take 2–3 weeks for evaluation.
- Does this work with a suppressor?
- No, the 940 Pro Tactical SPX is not suppressor-ready; the barrel lacks threading for choke tubes with suppressor mounts. For suppressed shotguns, consider a specialized model like the Mossberg 590A1 with a threaded barrel, which requires a tax stamp and adapter.