Mossberg 940 Pro Turkey 12ga 18.5in Mossy Oak Greenleaf
Video review
Expert review
About this product
The Mossberg 940 Pro Turkey is a semi-automatic 12-gauge shotgun engineered for reliability in turkey and field conditions with specific features like an optic-ready receiver and a dedicated turkey choke. I consider this a purpose-built tool that balances Mossberg's proven gas system innovations with contemporary modularity demands. At its core, it's a specialized iteration of the 940 platform designed to perform under specific pressures, not a generalist hunting gun.
What is the Mossberg 940 Pro Turkey 12ga 18.5in Mossy Oak Greenleaf used for?
It's used for turkey hunting and dense-cover fieldwork where a dedicated, short-barreled, and fast-handling shotgun is required. The 18.5-inch barrel and aggressive X-Factor XX-Full ported choke are optimized for dense TSS or heavy lead loads at ranges inside 40 yards, making it a specialist rather than a versatile upland gun. The adjustable LOP and optic cuts allow for a precise, repeatable fit and red-dot capability, which is critical for headshot consistency on a stationary bird.
How does the Mossberg 940 Pro Turkey compare to the Stevens 555 Sporting O/U 12 Gauge 30in?
It is better for a single, precise shot from a fixed position, while the Stevens 555 Sporting O/U is superior for sustained, multi-target sport shooting. The Mossberg's 18.5-inch barrel and adjustable gas system handle 3-inch magnum loads with less felt recoil than a break-action shotgun, increasing follow-up speed from a blind. However, for formal trap, skeet, or sporting clays, the Stevens 555's 30-inch barrels provide a smoother swing plane and better target acquisition at longer ranges, making the Mossberg a poor choice for the clay sports range.
What does it weigh and what are the dimensions?
The Mossberg 940 Pro Turkey weighs 7.1 pounds unloaded and measures 39.5 inches in overall length with the stock collapsed. The 18.5-inch vent rib barrel has a 3-inch chamber, while the synthetic stock adjusts across a 1.25-inch LOP range from 13 inches to 14.25 inches, accommodating most adult shooters in heavy clothing. This weight distribution, concentrated in the receiver and gas system, makes it feel muzzle-light and fast in cramped blinds compared to a traditional 28-inch field gun, but it can feel unbalanced when swung on crossing targets.
Who is this NOT for?
This shotgun is not for recreational clay shooters, waterfowlers needing a 3.5-inch chamber, or anyone seeking a multi-purpose upland game gun. Its XX-Full choke is prohibitively tight for standard target loads or flying game, and the short barrel sacrifices the necessary swing dynamics for consistent pass-shooting. If your primary goals involve a variety of hunting disciplines or high-volume shooting, a more versatile platform like an over/under is a better fit for a first shotgun or a generalist's safe.
What's in the box?
You receive the shotgun with one installed X-Factor XX-Full ported turkey choke tube, one HiViz CompSight fiber optic front sight, and the standard wrench for adjustment and disassembly. The optic-ready receiver comes with protective cover plates installed in the RMSc-pattern cuts, and the synthetic stock includes the Allen key for LOP adjustment stored within the buttpad. Notably, you do not receive additional choke tubes, a sling, or a case, which are common accessories for other Mossberg models; this reinforces its specialized, out-of-the-box readiness for a single task.
Is the Mossberg 940 Pro Turkey worth it at $1019.99?
Yes, it is worth the investment for a serious turkey hunter requiring a modern, gas-operated system with optic compatibility and reliable function with heavy loads. The cost reflects the nickel-boron coated internals, corrosion-resistant gas piston, and the factory-installed camo finish, which would add $250-350 if applied aftermarket to a base model. For the shooter who wants a dedicated, suppressor-ready turkey gun with proven semi-auto reliability, this price is competitive against the aftermarket modifications needed to bring a standard field gun to this specification.
Specs at a glance
Pros & cons
What works
- Optic-ready RMSc-pattern cuts milled directly into the receiver — eliminates a mounting plate and reduces sight height over bore by 0.1 inches.
- Adjustable length of pull spans 1.25 inches (13"-14.25") — accommodates shooters from 5'8" to over 6'2" in heavy field clothing.
- Nickel-boron coated trigger group and bolt assembly — reduces friction and eases cleaning after 100+ rounds of dirty target loads.
- Factory-installed Mossy Oak Greenleaf camo on metal and synthetic components — provides a $250+ value finish out of the box.
Trade-offs
- Includes only one XX-Full turkey choke tube — purchasing additional constrictions like Improved Cylinder or Modified requires a separate $35-50 investment.
- Vent rib and fiber optic front sight are not tritium — provides no illumination in low-light pre-dawn conditions without an attached weapon light or optic.
- Gas system requires a detailed strip for proper cleaning every 300-400 rounds — adds 15 minutes of maintenance compared to a simpler inertia or pump system.
Key attributes
| upc | 015813851589 |
| manufacturer | Mossberg |
| manufacturer part number | 85158 |
| action | Semi-Auto |
| atf type | Shotgun |
| barrel finish | Mossy Oak Greenleaf |
| barrel length | 18.5" VR |
| caliber/gauge | 12 Gauge |
| capacity | 4 + 1 |
| chokes included | XX-Full Turkey Ported |
| color | CAMOFLAGE |
| length | 46.375 |
| model | 940 Pro |
| package height | 9.0 |
| package width | 3.5 |
| product type | Shotgun |
| safety | Tang |
| shipping weight | 9.7 |
| sights | HiViz CompSight Fiber Optic |
| sights type | Fixed Sights |
Frequently asked questions
- Is it compatible with an RMSc-pattern red dot sight?
- Yes, the receiver is machined with precisely placed cuts for direct mounting of low-profile RMSc-pattern micro red dots like the Shield RMSc or SIG RomeoZero. The mounting surface is clean and does not require an intervening plate for proper alignment, a design choice that saves approximately 0.1 inches in optic height over a universal adapter plate. Ensure your chosen optic's footprint matches the exact RMSc pattern for a secure fit.
- Will the 18.5-inch barrel make it an NFA-regulated short-barreled shotgun (SBS)?
- No, as a factory-configured shotgun with an 18.5-inch barrel and a stock, it is not an NFA item. Federal law defines a short-barreled shotgun as having a barrel less than 18 inches in length or an overall length under 26 inches; this model's 39.5-inch overall length and 18.5-inch barrel place it well within Title I sporting configurations. Do not modify the barrel to under 18 inches without the proper ATF Form 1 tax stamp and approval, as that would create an illegal SBS.
- Does it work with standard Mossberg 500/590 or Beretta MobilChoke tubes?
- No, it uses the proprietary Mossberg Accu-Choke threading system, which is not compatible with Beretta/Benelli MobilChokes or the older Mossberg 500/590 fixed-choke barrels. The included X-Factor XX-Full tube is ported for this specific barrel, and aftermarket Accu-Chokes in other constrictions from Mossberg or brands like Carlson's will fit. Confirm any aftermarket tube is marked for "Accu-Choke (NEW)" or 940-series threading to avoid damaging the barrel's internal threads.
- How long does shipping take from Ironclad Armory?
- Ironclad Armory processes and transfers firearms to your chosen FFL within 3 business days of cleared payment, with shipping transit times varying by carrier and distance. A lower 48-state shipment via UPS Ground typically arrives at your FFL in 5-7 additional business days, so plan for a total of 8-10 business days from order to FFL arrival. You will receive tracking information once the firearm is scanned into the carrier's system by our logistics team.