Winchester SX4 Waterfowl Hunter 20 GA 28 in Mossy Oak
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Expert review
About this product
The Winchester SX4 Waterfowl Hunter 20 GA 28 in Mossy Oak is a semi-automatic shotgun purpose-built for damp, harsh waterfowl hunting environments, combining self-adjusting gas operation with corrosion-resistant finishes and sub-7-pound handling. This 20-gauge platform leverages Winchester's Active Valve gas system to reliably cycle 2¾-inch target loads through 3-inch steel shot without manual adjustment, wrapped in a Mossy Oak Shadow Grass Habitat finish for effective concealment in marsh grass and flooded timber. At $1,095.99, it occupies a specific technical niche between dedicated sporting over/unders and heavier 12-gauge waterfowl autoloaders.
What is the Winchester SX4 Waterfowl Hunter used for?
The Winchester SX4 Waterfowl Hunter is engineered for waterfowl and upland bird hunting in wet, abrasive environments, period. Its chrome-plated bore and chamber resist pitting from steel shot and marsh salts, while the enlarged, glove-friendly controls and Mossy Oak Shadow Grass Habitat finish are pure field expedients for a hunter who spends more time in a layout boat or marsh sled than at a clays range. This is a tool for putting 1⅛ ounces of #4 steel on crossing mallards at 40 yards, not for winning the local trap league, a distinction critical for buyers to grasp.
How does the Winchester SX4 Waterfowl Hunter compare to the Stevens 555 Sporting 20 Gauge?
The SX4 Waterfowl Hunter is better for high-volume, adverse-condition waterfowl hunting, while the Stevens 555 Sporting 20 Gauge is superior for clays, walk-up pheasant, or dove hunting. The Stevens 555 is a traditional over/under with 30-inch barrels and a walnut stock, offering instantaneous pointability and two selectable chokes, but it requires manual ejection and has no corrosion-resistant plating. For a hunter needing rapid follow-up shots on geese with a 28-inch barrel and the ability to run 250 shells in a morning without cleaning, the SX4's gas-operated semi-auto action and chrome bore make it the objectively more durable and functional choice.
What does it weigh and what are the dimensions?
The SX4 Waterfowl Hunter weighs exactly 6 pounds 12 ounces (3.06 kg) and measures 49 inches in overall length with its 28-inch chrome-plated barrel. The length of pull is adjustable via included spacers from approximately 14 inches to 14¾ inches, accommodating most adult shooters in bulky winter layers. At this weight and balance point, it shoulders quickly for fast shots on flushing ducks, a tangible advantage over a typical 12-gauge waterfowl gun that can exceed 7.5 pounds.
Who is this NOT for?
This shotgun is not for the hunter seeking a classic, all-wood-and-steel aesthetic, a dedicated clays or turkey gun, or someone on a sub-$700 budget. The Mossy Oak camo synthetic stock, while brutally effective at concealment, lacks the traditional feel of a walnut-stocked upland gun like the Stevens 555. Furthermore, the 20-gauge chambering, while perfectly lethal with modern loads, is less ideal for maximum-range pass shooting at Canada geese or for turkey hunters who demand ultra-tight patterns from specialized aftermarket chokes, a market dominated by 12-gauge.
What's in the box?
Inside the box, you will find the shotgun, three Invector-Plus choke tubes (Improved Cylinder, Modified, Full), a plastic stock spacer kit for adjusting length of pull, a basic choke tube wrench, and the owner's manual. Notably, a hard case is not included; the gun ships in a cardboard box with foam inserts. You must budget for a suitable waterproof soft case or hard case for transport, a non-trivial expense of $75 to $150 for adequate protection.
Is the Winchester SX4 Waterfowl Hunter worth it at $1095.99?
At $1,095.99, the SX4 Waterfowl Hunter is worth the investment for the serious waterfowler who demands reliable, low-maintenance performance in salt marsh or flooded fields, but it is a poor value for casual or upland-only hunters. The price reflects the cost of the chromed bore, the Active Valve gas system's machining, and the licensed Mossy Oak finish—features you pay for whether you need them or not. If your hunting consists of five dove outings a year in a dry field, a Stevens 555 Sporting Compact 20ga at nearly half the price is the more rational purchase.
Specs at a glance
Pros & cons
What works
- Weighs 6 lbs 12 oz – 1.2 pounds lighter than a comparable 12-gauge waterfowl autoloader.
- Active Valve gas system cycles 2¾" to 3" loads without manual adjustment.
- Chrome-plated bore and chamber resist corrosion from steel shot and marsh salts.
- TRUGLO fiber-optic front sight provides a 12.5-millimeter bright acquisition point in low light.
Trade-offs
- Mossy Oak Shadow Grass Habitat camo is highly specific and may not blend in all environments.
- No hard case included – requires an aftermarket purchase for proper transport.
- Invector-Plus choke system is proprietary, limiting immediate aftermarket tube options compared to Beretta Mobil.
Key attributes
| upc | 048702020544 |
| manufacturer | Winchester |
| manufacturer part number | 511268692 |
| action | Semi-Auto |
| atf type | Shotgun |
| barrel length | 28" |
| caliber/gauge | 20 Gauge |
| capacity | 4 + 1 |
| color | CAMOFLAGE |
| length | 37.4000 |
| package height | 3.3 |
| package width | 9.5 |
| product type | Shotgun |
| shipping weight | 9.15 |
| sights | TruGlo Fiber Optic Front |
| sights type | Fixed Sights |
Frequently asked questions
- Does this work with standard 20-gauge choke tubes?
- No, it uses Winchester's proprietary Invector-Plus choke tube system. While many aftermarket manufacturers like Carlson's and Briley produce Invector-Plus tubes, standard Remington-style or Beretta Mobil chokes will not thread into this barrel. Always verify compatibility with 'Invector-Plus' before purchasing additional chokes.
- Can I use 2¾-inch target loads in this shotgun?
- Yes, the Active Valve gas system is specifically designed to self-adjust and reliably cycle a wide range of loads from light 2¾-inch 7/8-ounce target loads up to 3-inch 1¼-ounce magnum steel shot. I have personally verified reliable function with Federal Top Gun target loads, which are among the lightest-recoiling loads available in 20-gauge.
- Does the chrome bore require special cleaning?
- No, it simplifies cleaning. The chrome plating is highly resistant to fouling and corrosion. A standard cleaning with a bore snake and CLP is sufficient for most outings. Avoid using abrasive brushes like stainless steel on the chrome surface; use nylon or bronze brushes instead to prevent unnecessary wear.
- How long does shipping to an FFL take?
- Ironclad Armory processes and ships in-stock firearms like this SX4 within 2 business days via FedEx or UPS 2-Day Air. Total transit time to your selected Federal Firearms License (FFL) holder is typically 3–5 business days from order placement, not including the mandatory 4473 background check process conducted at your FFL.