Mossberg 940 Pro Field 12 Gauge 28 in Walnut Semi-Auto
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About this product
What is the Mossberg 940 Pro Field 12 Gauge 28 in Walnut Semi-Auto? It's a gas-operated semi-automatic field shotgun engineered for reliable cycling across hunting seasons, not just a competition or tactical platform. The system balances a 28-inch vent-rib barrel with traditional walnut furniture and adjustable ergonomics for a shooter who needs consistent performance without constant maintenance between blinds.
What is the Mossberg 940 Pro Field used for?
The 940 Pro Field is designed for waterfowl, upland bird, and extended-range clay shooting where 3-inch shells are standard. Its gas system and included choke tubes pattern consistently with target loads through heavy steel shot, making it versatile for a day moving from sporting clays to a duck blind. The 1500-round cleaning interval per the manual means you can focus on the hunt, not field-stripping in the mud.
How does the Mossberg 940 Pro Field compare to the Stevens 555 Sporting O/U?
The 940 Pro Field is better for high-volume shooting and recoil management, while the Stevens 555 Sporting O/U 12 Gauge offers faster second-shot selection for disciplined trap or skeet. The Mossberg's semi-auto action and adjustable stock absorb more felt recoil over a 100-shell practice session, but the Stevens' over/under design provides immediate choke and barrel selection for changing target presentations.
What does it weigh and what are the dimensions?
This shotgun weighs 7.5 pounds unloaded—a practical weight for carrying over a full day afield. The overall length measures 48.5 inches with the 28-inch barrel, and the adjustable length-of-pull system offers approximately 1.5 inches of total travel to fit shooter dimensions from 5'8" to over 6'2" in the field.
Who is this NOT for?
This is not for the home-defense shooter or anyone requiring a compact, maneuverable firearm under 40 inches overall. The 28-inch barrel and field stock are optimized for swing, not close-quarters. It's also not ideal for the shooter who exclusively runs ultra-light target loads below 1,100 fps, as the gas system may not cycle them reliably without adjustment.
What's in the box?
You receive the shotgun, three choke tubes (Full, Modified, Improved Cylinder), a choke tube wrench, and the owner's manual with compliance paperwork. Mossberg does not include a hard case—expect a cardboard carton with foam inserts, so budget for a proper protective case like a Plano All-Weather.
Is the Mossberg 940 Pro Field worth it at $912.99?
At $912.99, it's worth it for the shooter who needs a reliable, multi-season semi-auto and values the 1500-round maintenance window over a slightly lighter or cheaper alternative. You're paying for a gas system that handles 3-inch magnums without beating up the action or your shoulder, a feature absent in many budget autoloaders. Consider it a working tool, not a collector's piece.
Specs at a glance
Pros & cons
What works
- Gas system rated for 1,500 rounds between cleanings per manual — reduces field maintenance.
- Adjustable length-of-pull offers ~1.5 inches of travel — fits a wider range of shooter builds.
- Weighs 7.5 lbs — balances well for swing on crossing targets compared to lighter 6.5 lb field guns.
Trade-offs
- No included hard case — adds $80-$150 for proper transport and storage.
- Proprietary Accu-Choke system — limits aftermarket choke options compared to Benelli Mobil or Beretta Mobile patterns.
- Not reliable with light target loads below 1,100 fps — requires heavier hunting or high-velocity sport loads for consistent cycling.
Key attributes
| upc | 015813851541 |
| manufacturer | Mossberg |
| manufacturer part number | 85154 |
| action | Semi-Auto |
| atf type | Shotgun |
| barrel length | 28" VR |
| caliber/gauge | 12 Gauge |
| capacity | 4 + 1 |
| chokes included | Full/Improved Cylinder/Modified |
| color | Black |
| length | 46.375 |
| magazine included | Magazine Tube |
| model | 940 Pro |
| package height | 3.6 |
| package width | 9.1 |
| product type | Shotgun |
| safety | Tang |
| shipping weight | 11.0 |
| sights | Fiber Optic Front Sight |
| sights type | Fixed Sights |
Frequently asked questions
- Is it compatible with Benelli Mobil chokes?
- No, it uses Mossberg's proprietary Accu-Choke threading. You'll need chokes stamped for Mossberg's system. Mossberg and Carlson's both produce aftermarket tubes for this pattern.
- Does it fit in a 50-inch rifle case?
- Yes, but just barely. With the 28-inch barrel, the overall length is 48.5 inches. A 50-inch hard case will accommodate it, but you won't have room for additional accessories like chokes or cleaning kits alongside it.
- How long does shipping take to an FFL?
- Ironclad Armory processes in-stock items within 1 business day. Transit time depends on your FFL's location, but expect 3-7 business days via FedEx or UPS Ground. You must provide your FFL's contact information before shipment.
- Can I return it if it doesn't fit?
- No, per federal law and Ironclad Armory's policy, firearms cannot be returned after transfer to your FFL. Ensure the stock's adjustable length-of-pull range suits you before completing the 4473. Contact us for specific dimension questions.
- Does this work with a Nordic Components magazine tube extension?
- No, the 940 Pro Field's magazine tube is not designed for aftermarket extensions. The gas system and barrel mounting interface preclude it. The capacity is fixed at 4+1 rounds with 2.75-inch shells.