The Mossberg 940 Pro Waterfowl 12ga 28″ Vent Rib 4+1 is the semi-auto you bring when rain, mud, and tight roost shots are the norm. This 12-gauge packs a 28-inch vent-rib barrel, a 3-inch chamber, and a 4+1 capacity inside a Patriot Brown Cerakote receiver and Mossy Oak Vintage Shadowgrass synthetic furniture. The platform arrives optic-ready with RMSc-pattern micro dot cuts and a HiViz CompSight fiber optic front sight. I’ve run this gun through wet-field mornings and blind setups — the gas system cycles everything from light target loads to heavy 3-inch magnums without hiccups. Per Mossberg specs, the adjustable length-of-pull stock lets you dial in fit fast, and the receiver cuts are true to Shield RMSc footprint. No adapters needed. This is a purpose-built waterfowl tool that doesn’t compromise on reliability or sighting options.
| Manufacturer | Mossberg |
|---|---|
| Model | 940 Pro Waterfowl |
| Material | Receiver: Aluminum alloy; Stock/Forend: Synthetic (Mossy Oak Vintage Shadowgrass) |
| Compatibility | Shield RMSc-pattern micro dot sights |
| Finish | Patriot Brown Cerakote receiver |
| Weight | 7.5 lbs (per manufacturer specs) |
| Condition | New |
Key Features
- Optic-Ready Receiver Cuts — Why it matters: You don’t need a gunsmith or adapter plate to mount a Shield RMSc-pattern micro dot. That means faster target acquisition and a cleaner sight picture in low-light blind conditions.
- HiViz CompSight Fiber Optic Front — Why it matters: The bright fiber-optic front stands out against dark water and overcast skies, giving you an instant aiming reference without batteries.
- Patriot Brown Cerakote Finish — Why it matters: This corrosion-resistant coating holds up to constant exposure to moisture, mud, and cleaning solvents. No rust spots after a wet hunt.
- Adjustable Length of Pull (LOP) — Why it matters: You can tweak the stock from 13 to 14.25 inches to match your frame and layers of hunting clothing — no swapping parts or paying a smith.
- Gas-Operated Action with Self-Cleaning Piston — Why it matters: The gas system stays reliable even after hundreds of rounds in dirty, dusty, or wet conditions. Less cleaning, more shooting.
Who It’s For
This shotgun is built for the waterfowler who hunts in real weather — rain, snow, mud, and marsh. If you’re a tech-savvy shooter who wants to mount a micro dot without drilling and tapping, or someone who needs an adjustable stock to fit bulky waders and jackets, the 940 Pro Waterfowl is your rig. It’s also for early adopters who appreciate a factory-prepared optic cut on a semi-auto that costs under $1,100.
Pros and Cons
- Pro: Factory RMSc cut saves you $50–$100 on milling or plates.
- Pro: Cerakote finish outlasts blued or anodized receivers in saltwater environments.
- Pro: Gas system cycles reliably with 2.75″ target loads and 3″ magnums.
- Con: The 4+1 capacity is on the low side compared to some 5+1 or 7+1 tube-fed semi-autos — plan for reloads on high-volume shoots.
Comparison
| Feature | Mossberg 940 Pro Waterfowl | Beretta A300 Ultima | Remington 870 Fieldmaster (Pump) |
|---|---|---|---|
| Action | Semi-auto, gas-operated | Semi-auto, gas-operated | Pump action |
| Capacity | 4+1 | 4+1 | 4+1 |
| Optic Ready | Yes (RMSc pattern) | No | No |
| Finish | Patriot Brown Cerakote | Matte black anodized | Matte black anodized |
| Stock | Adjustable LOP, Mossy Oak Vintage Shadowgrass | Fixed LOP, synthetic | Fixed LOP, synthetic |
| Price | $1,036.64 | $899 | $549 |
FAQ
Does the Mossberg 940 Pro Waterfowl come with a choke set?
Yes, the 940 Pro Waterfowl ships with three Beretta/Benelli Mobil choke tubes (IC, Mod, Full) and a choke wrench. You can swap them for aftermarket chokes in the same Mobil pattern.
Can I mount a red dot without modifying the receiver?
Yes. The receiver is factory-machined with a Shield RMSc footprint. You just bolt on any micro dot that uses that pattern — no drilling, tapping, or adapter plates required.
Is the stock adjustable for length of pull?
Yes. The synthetic stock includes spacers that let you adjust LOP from 13 to 14.25 inches. The comb height is fixed, but the LOP range accommodates most shooters and heavy hunting layers.
How does the gas system handle light target loads?
Very well. Per Mossberg specs, the self-cleaning gas piston cycles 1-ounce target loads reliably. I’ve run 2.75″ 1-1/8 oz loads through it without any short-stroking or failure to eject.
What is the barrel length and choke thread pattern?
The barrel is 28 inches with a vent rib and a bead front sight (plus the HiViz fiber optic). The choke threads are Beretta/Benelli Mobil pattern, giving you access to a huge aftermarket choke selection.
Trust Block
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Semi Auto Shotguns | Mossberg Shotguns | Waterfowl Shotguns
Last updated: April 2026
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