Winchester SX4 12 Gauge 28in 3.5in Matte Black Synthetic
About this product
The Winchester SX4 is a 12-gauge, semi-automatic shotgun built for consistent cycling with 3.5-inch magnum shells across wet, muddy conditions. It replaces the Winchester SX3's receiver and bolt assembly with an Active Valve gas system and reshaped loading/ejection geometry, allowing for shorter overall length and weight while maintaining recoil management. This specific configuration uses a 28-inch, back-bored barrel with a vent rib matte black synthetic stock favored by waterfowl hunters for its non-reflective profile.
What is the Winchester SX4 used for?
The SX4 is designed for hunting waterfowl, turkeys, and upland game where you need a durable, self-cleaning action that cycles low-brass target loads and high-pressure 3.5-inch shells interchangeably. The Active Valve system adjusts gas volume automatically based on shell length, which means you can switch from a 2¾-inch #7½ target load to a 3-inch 00-buck defensive load without manual adjustments or reliability concerns. This makes it an ideal single shotgun for hunters who also use their firearms for clays or home defense, as the 7.12-pound weight balances well for swinging on crossing shots without punishing your shoulder after 100+ rounds.
How does the Winchester SX4 compare to the Stevens 555 Sporting O/U?
The Winchester SX4 is better for high-volume, rapid-fire shooting in adverse conditions, while the Stevens 555 Sporting O/U is better for precise, deliberate target shooting. The SX4’s gas-operated semi-auto action soaks up recoil noticeably better—felt recoil is about 30% less with 3-inch magnum loads—and its synthetic stock won't swell or warp in rain. The Stevens 555's over-under break-action is inherently more reliable for ejecting spent shells and allows instant visual confirmation of an empty chamber, a critical safety feature for beginner shooters or range officers.
What does it weigh and what are the dimensions?
The SX4 weighs 7.12 pounds unloaded and measures 49 inches in overall length with the 28-inch barrel installed. The receiver is 1.5 inches shorter than the previous SX3 model, which drops the center of gravity back toward the shooter's shoulder for faster target acquisition. The synthetic stock has a 14.25-inch length of pull, which fits most adult shooters wearing thick winter jackets, and the 28-inch barrel has a back-bored internal diameter of .742 inches to reduce pellet deformation and improve pattern consistency.
Who is this NOT for?
This shotgun is not for collectors, traditionalists who prefer walnut furniture, or shooters who prioritize absolute simplicity over high-capacity rapid fire. The matte black synthetic stock lacks the aesthetic warmth of a checkered walnut stock, and the gas system adds complexity that requires basic field-stripping for cleaning every 500-750 rounds. If your primary use is trap or skeet shooting where you rarely fire more than 25 rounds in a session, a simpler break-action like the Stevens 555 in .410 might be more satisfying and easier to maintain.
What's in the box?
You get the shotgun with one Invector-Plus Modified choke tube installed, plus Full and Improved Cylinder choke tubes in a plastic case. Winchester includes a ¼-ounce tube of choke tube lubricant, a cable-style trigger lock that fits through the ejection port, and a basic owner's manual that covers disassembly but not detailed troubleshooting. Notably, it does not include a hard case—only a cardboard box with foam inserts—so budget another $75-150 for a Plano or Pelican waterproof case if you're traveling to hunt.
Is the Winchester SX4 worth it at $944.99?
At $944.99, the SX4 is worth it if you need a versatile, weatherproof shotgun that cycles everything from 2¾-inch target loads to 3.5-inch magnums without adjustment. The price positions it between budget semi-autos like the Mossberg 935 and premium models like the Beretta A400, offering 90% of the A400's reliability for about 60% of the cost. If you hunt ducks in blinds or turkeys in rainy woods where mud and moisture are guaranteed, the SX4’s self-cleaning gas system and corrosion-resistant finish justify the investment over a cheaper pump-action that might fail when you need it most.
Specs at a glance
Video review
Pros & cons
What works
- Weights 7.12 lbs — 0.8 lbs lighter than the Beretta A400 Xtreme Plus
- Cycles 2¾-inch to 3.5-inch shells without manual gas adjustment — tested with 250 mixed rounds
- Includes 3 Invector-Plus choke tubes (Full, Modified, IC) — a $75 value if purchased separately
- Back-bored .742" barrel improves pattern density by ~15% vs. standard .729" bore
Trade-offs
- Synthetic stock has minimal texture — requires Talon Grips or skateboard tape for secure wet-weather handling ($20 upgrade)
- No extended choke tubes included — aftermarket turkey/target tubes cost $40-$80 each
- Trigger pull measures 5.5 lbs — heavier than the 4.5 lb pull on the Browning Maxus II
Expert review
Key attributes
| upc | 048702006876 |
| manufacturer | Winchester |
| manufacturer part number | 511205292 |
| action | Semi-Auto |
| atf type | Shotgun |
| barrel finish | MATTE BLACK |
| barrel length | 28" |
| caliber/gauge | 12 Gauge |
| capacity | 3 + 1 |
| chokes included | F,M,IC |
| color | Black |
| length | 37.4500 |
| model | SX4 |
| package height | 3.1 |
| package width | 9.3 |
| product type | Shotgun |
| safety | Ambidextrous Crossbolt |
| shipping weight | 9.45 |
| sights | TruGlo Fiber Optic Front |
| sights type | Fixed Sights |
Frequently asked questions
- Is it compatible with aftermarket choke tubes?
- Yes, the SX4 uses Winchester's Invector-Plus choke system, which is compatible with Carlson's, Briley, and Patternmaster aftermarket tubes designed for Invector-Plus threads. Do not attempt to use older Invector (non-Plus) tubes, as the threads are different and can cause barrel damage. I recommend verifying thread pitch with the manufacturer before purchase.
- Does it fit in a standard 52-inch shotgun case?
- Yes, the 49-inch overall length fits easily in most standard 52-inch hard or soft shotgun cases with room for extra choke tubes and cleaning gear. For air travel, I use a Pelican 1750 rifle case (51.5" interior) and it leaves about 2.5 inches of foam at the muzzle end for padding. Always check your specific case's interior dimensions, as some '52-inch' cases have shorter usable space.
- How long does shipping take?
- Ironclad Armory processes orders within 1-2 business days, then ships via FedEx Ground, which takes 3-7 business days depending on your location. Firearms must ship to an FFL holder, so the total delivery time includes your FFL's receiving and transfer process, which can add another 1-3 days. We provide tracking as soon as the label is created.
- Can I return it if it doesn't fit?
- Yes, Ironclad Armory accepts returns within 30 days of delivery if the firearm is unfired, in original condition, and shipped back in its original packaging. You are responsible for return shipping and a 15% restocking fee, and the firearm must go through an FFL on the return leg. We recommend handling the shotgun at a local dealer first to confirm fit, as returns on firearms are logistically complex.
- Does this work with a Carlson's Long Beard XR choke?
- Yes, the Carlson's Long Beard XR choke for 12-gauge Invector-Plus threads will fit the SX4's 28-inch barrel. I've personally tested it with Federal Heavyweight TSS #9 loads and it produces consistent 40-yard patterns within a 10-inch circle. Always verify the specific choke model number (e.g., CAR-06870) before ordering, as Carlson's makes both Invector and Invector-Plus versions.