Description
The Winchester SX4 20 Gauge 24-inch Synthetic Semi-Auto Shotgun is a field-tested workhorse that cycles everything from light target loads to heavy 3-inch magnums without a hiccup. Built around a lightweight aluminum-alloy receiver and a textured synthetic stock, this 20-gauge brings the proven SX4 gas-operated system into a smaller, faster-handling package. Per Winchester specs, the hard chrome-plated bore and chamber resist corrosion season after season. The 24-inch barrel with TRUGLO fiber-optic front sight gets on target fast, and the Inflex Technology recoil pad makes extended days in the field or on the clays range noticeably more comfortable.
| Manufacturer | Winchester |
|---|---|
| Model | SX4 |
| Material | Aluminum-alloy receiver, synthetic stock |
| Compatibility | 20 Gauge, 2.75- and 3-inch shells |
| Finish | Matte black, non-glare |
| Weight | 6 lb 4 oz (per manufacturer specs) |
| Condition | New |
Key Features
- Invector-Plus Choke System – Why it matters: You get three flush-mounted chokes (F, M, IC) that let you dial in patterns from tight turkey loads to open spreads on flushing birds, all without swapping barrels.
- Active Valve Gas System – Why it matters: This self-cleaning piston cycles reliably across a wide range of shell pressures, meaning you can shoot 7/8-ounce target loads and heavy 3-inch magnums in the same outing with no adjustment.
- TRUGLO Fiber-Optic Front Sight – Why it matters: The bright green fiber gathers ambient light for a clear sight picture in dawn, dusk, or heavy cover, so you don’t lose that split-second advantage on a flushing rooster.
- Inflex Technology Recoil Pad – Why it matters: The directional recoil pad compresses rearward and downward, pulling the comb away from your cheek and reducing felt recoil by up to 54% compared to standard pads—critical for lighter 20-gauge guns.
- Hard Chrome-Plated Bore and Chamber – Why it matters: Chrome lining resists rust and fouling buildup, so you can hunt in wet conditions or skip a cleaning session without worrying about corrosion eating into accuracy.
Who It’s For
This shotgun is built for the upland hunter who spends miles walking CRP ground for pheasants and quail, the duck hunter who needs a lighter gun for long carries to the blind, and the clay shooter who wants a 20-gauge that doesn’t beat them up over a box of shells. It’s also a solid choice for smaller-framed shooters or anyone stepping down from a 12-gauge without sacrificing reliability.
Pros & Cons
- Pro: Weighs just 6 lb 4 oz—one of the lightest 20-gauge semi-autos in its class, making it easy to carry all day.
- Pro: The Active Valve gas system cycles reliably with light 7/8-ounce loads, so you can shoot cheap target ammo without short-stroking.
- Pro: Invector-Plus chokes are widely available and affordable, letting you swap patterns for under $30 per tube.
- Con: The synthetic stock has a hollow feel compared to walnut-stocked shotguns, and the forend can flex slightly under hard pressure—a trade-off for the weight savings.
Comparison
| Feature | Winchester SX4 20 Gauge | Remington 870 20 Gauge | Mossberg 930 20 Gauge |
|---|---|---|---|
| Action | Gas-operated semi-auto | Pump-action | Gas-operated semi-auto |
| Weight | 6 lb 4 oz | 6 lb 8 oz | 7 lb 2 oz |
| Chamber | 3-inch | 3-inch | 3-inch |
| Choke System | Invector-Plus | Rem Choke | Accu-Choke |
| Recoil Pad | Inflex Technology | SuperCell | Standard |
| Price | $967.64 | $499.00 | $599.00 |
| Best For | Hunters wanting fast follow-ups and low recoil | Budget-conscious shooters who prefer pump reliability | Target shooters on a budget who want semi-auto |
FAQ
Will this shotgun cycle light target loads reliably?
Yes. The Active Valve gas system is designed to handle a wide range of shell pressures. Most shooters report reliable cycling with 7/8-ounce target loads right out of the box, though a few boxes of heavy field loads during break-in (100–150 rounds) can help ensure smooth function with lighter ammo.
Can I mount a red dot or scope on this SX4?
The receiver is drilled and tapped for scope bases, but the 24-inch barrel is not ported. You can mount a low-profile red dot using a Picatinny rail adapter, but a traditional scope may interfere with the comb height. Consider a see-through mount if you want to keep using the TRUGLO fiber-optic sight.
Does the 24-inch barrel pattern well for waterfowl?
Yes, with the included full choke, the 24-inch barrel produces tight, consistent patterns at 40 yards—ideal for pass-shooting ducks or geese. The shorter barrel also swings faster in timber or marsh cover compared to a 26- or 28-inch barrel.
Is this shotgun suitable for left-handed shooters?
The SX4 is a right-handed action with a right-side ejection port. Left-handed shooters can still operate it, but ejected shells will pass near the face. Winchester does not offer a left-handed version of the SX4 in 20 gauge.
What chokes come in the box?
Three Invector-Plus flush chokes are included: Full (F), Modified (M), and Improved Cylinder (IC). A choke wrench is also included.
Why Buy from Us
- ✅ Nationwide delivery to all 50 states
- ✅ Ships within 1–2 business days
- ✅ 30-day returns on unused, unfired firearms
- ✅ Secure checkout with encrypted payment processing
Explore more options in our Semi Auto Shotguns or 20 Gauge Shotguns collection. Need a reliable upland companion? Check out Upland Shotguns.
Last updated: April 2026
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