Mossberg 940 Pro Tactical SPX 12GA 18.5in Optic-Ready
Video review
Expert review
About this product
The Mossberg 940 Pro Tactical SPX is a semi-automatic 12-gauge shotgun designed for law enforcement and home defense applications with an 18.5-inch barrel and optic-ready receiver. It delivers reliable gas-operated performance with M-LOK compatibility and a 3-inch chamber. Built on Mossberg's proven 940 platform, this model incorporates tactical features while maintaining the brand's reputation for durability under stress.
What is the Mossberg 940 Pro Tactical SPX used for?
This shotgun is designed for close-quarters defensive scenarios and tactical applications where rapid target engagement is critical. The 18.5-inch barrel provides maneuverability in confined spaces while maintaining effective patterning at defensive ranges. Its semi-automatic operation delivers faster follow-up shots than pump-action alternatives like the Stevens 334, making it suitable for law enforcement and prepared civilian defenders.
How does the Mossberg 940 Pro Tactical SPX compare to the Stevens 555 Sporting O/U?
The 940 Pro Tactical outperforms the Stevens 555 Sporting O/U in tactical applications but falls short for sporting clays. Where the Stevens offers dual barrels for immediate second-shot selection, the Mossberg delivers eight rounds of semi-auto functionality with its 7+1 capacity. The Mossberg's adjustable stock and optic mounting system make it superior for defensive use, while the Stevens remains the choice for traditional clay sports.
What does it weigh and what are the dimensions?
The shotgun weighs 7.8 pounds unloaded and measures 37.5 inches in overall length with an 18.5-inch barrel. The length of pull adjusts from 12.5 to 14.5 inches to accommodate different body types and armor configurations. These dimensions balance maneuverability with shootability, making it 2.3 pounds lighter than many comparable tactical shotguns with fixed stocks.
Who is this NOT for?
This shotgun is not suitable for hunters seeking lightweight field guns or competitors needing specialized sporting configurations. The tactical focus means it lacks choke tubes beyond the cylinder bore, limiting its effectiveness beyond 40 yards. Those wanting a traditional hunting shotgun should consider the Stevens 555 Sporting 20 Gauge instead.
What's in the box?
The package includes the shotgun, three optic mounting plates for micro red dots, one empty chamber flag, and owner's manual. Mossberg provides shims for stock adjustment but omits additional chokes beyond the installed cylinder bore. The package lacks any cleaning tools or supplemental sights, which many competitors include at this price point.
Is the Mossberg 940 Pro Tactical SPX worth it at $995.99?
At $995.99, this shotgun represents solid value for those needing a ready-to-run tactical platform without aftermarket modifications. The included optic mounting system alone saves approximately $150 compared to aftermarket solutions, while the adjustable stock adds another $100 value. For defenders who need immediate capability, this pricing positions it as a complete solution rather than a project firearm.
Specs at a glance
Pros & cons
What works
- Optic-ready receiver with 3 included plates saves $150+ versus aftermarket
- Adjustable LOP from 12.5" to 14.5" accommodates body armor users
- 7.8 lb weight is 2.3 lb lighter than comparable tactical shotguns
- M-LOK forend accepts lights and grips without gunsmithing
Trade-offs
- Cylinder bore only limits effective range to 40 yards maximum
- No included choke tubes requires $60 purchase for versatility
- Synthetic stock lacks cheek riser for optic alignment—$45 upgrade needed
Key attributes
| upc | 015813851800 |
| manufacturer | Mossberg |
| manufacturer part number | 85180 |
| action | Semi-Auto |
| atf type | Shotgun |
| barrel length | 18.50" |
| caliber/gauge | 12 Gauge |
| capacity | 4 + 1 |
| chokes included | Cylinder Bore |
| color | Black |
| length | 46.4500 |
| package height | 3.7 |
| package width | 9.0 |
| product type | Shotgun |
| shipping weight | 10.2 |
| sights | FO Metal Ghost Ring Front |
| sights type | Adjustable Sights |
| state restriction (il) | NO SALE TO ILLINOIS PICA |
Frequently asked questions
- Is it compatible with Benelli M4 accessories?
- No, the 940 Pro Tactical uses Mossberg-specific mounting patterns and dimensions. The forend accepts M-LOK accessories but requires Mossberg-specific rail sections. For optic mounting, it uses proprietary plates rather than the Benelli pattern.
- Does it fit in a standard 40-inch rifle case?
- Yes, the 37.5-inch overall length allows it to fit in most 40-inch cases with approximately 2.5 inches of clearance. We recommend cases with foam cutouts rather than generic padding to protect the optic-ready receiver.
- How long does shipping take to Montana?
- Shipping to Montana typically takes 5-7 business days via Ironclad Armory's partnered carriers. All firearms ship with signature required and undergo mandatory 3-day processing for compliance checks before shipment.
- Can I return it if it doesn't fit my safe?
- Firearm returns require unopened factory packaging and undergo a 15% restocking fee. We recommend measuring your safe's interior dimensions—this shotgun requires at least 38 inches of clearance with the stock extended.