Winchester SX4 LH 12 Gauge, 28″ Barrel, Synthetic
About this product
The Winchester SX4 LH 12 Gauge is a left-handed semi-automatic shotgun specifically engineered for left-handed shooters with a 28-inch back-bored barrel and synthetic stock. This firearm uses Winchester's Active Valve gas system for reliable cycling and includes Invector-Plus choke tubes for versatility across hunting and sport shooting scenarios. At $1,002.99, it addresses the ergonomic needs of left-handers who've historically adapted to right-handed platforms.
What is the Winchester SX4 LH 12 Gauge used for?
This shotgun is built for waterfowl hunting, upland game, and clays shooting where left-handed ergonomics enhance performance. The 28-inch barrel provides a 50-inch overall length that balances swing dynamics for moving targets, while the 4+1 capacity meets most field requirements without excessive bulk. The synthetic stock withstands wet conditions better than wood, making it ideal for marshes and rainy environments.
How does the Winchester SX4 LH compare to the Stevens 555 Sporting O/U 12 Gauge?
The SX4 LH outperforms the Stevens 555 Sporting in rapid follow-up shots due to its semi-auto action versus over-under mechanics. While the Stevens offers two immediate choke options, the SX4’s gas system reduces perceived recoil by approximately 30%—critical for high-volume shooting days. The left-handed ejection on the SX4 prevents brass-to-face issues that southpaws face with symmetrical designs.
What does it weigh and what are the dimensions?
Unloaded weight is 7 pounds, 2 ounces (102.1 oz), with a 28-inch barrel contributing to a 50-inch overall length. The length of pull is adjustable from 14.25 to 14.75 inches using included spacers, accommodating most adult shooters. The back-bored barrel internal diameter measures 0.742 inches, reducing felt recoil and improving pattern consistency.
Who is this NOT for?
Right-handed shooters should avoid this model—ejection port orientation and safety placement create operational inefficiencies. Budget-conscious buyers may prefer the Stevens 334 Rifle for big-game hunting at nearly half the price. Tactical users needing magazine capacities exceeding 4+1 will find the fixed tube limiting for defense scenarios.
What's in the box?
You receive the shotgun, three Invector-Plus choke tubes (Full, Modified, Improved Cylinder), two length-of-pull spacers, and a manufacturer's warranty card. The chokes are shipped uninstalled but thread-sealed with anti-seize compound—clean barrels thoroughly before first use. No hard case is included; factor $75-$150 for aftermarket protection.
Is the Winchester SX4 LH worth it at $1,002.99?
Yes, for left-handed shooters seeking a dedicated semi-auto that eliminates adaptations required with right-handed guns. The Active Valve system cycles 1⅛-ounce target loads to 3-inch magnums without adjustment, saving time in mixed-game scenarios. Compared to custom left-hand conversions costing $400+, the factory-built ergonomics justify the premium for serious hunters.
Specs at a glance
Video review
Pros & cons
What works
- True left-handed ejection—prevents gas and brass contact for southpaws
- Active Valve gas system cycles 1⅛ oz to 3" mags without adjustment
- Inflex recoil pad reduces felt recoil by ~30% vs standard rubber pads
- Back-bored 0.742" barrel improves pattern consistency by 15%
Trade-offs
- No optic mounting system—drilling/tapping adds $200+ for red dots
- Synthetic stock lacks checkering—slick when wet without added grip tape
- Chokes ship uninstalled—requires tools and anti-seize for proper mounting
Expert review
Key attributes
| upc | 048702018749 |
| manufacturer | Winchester |
| manufacturer part number | 511252392 |
| action | Semi-Auto |
| atf type | Shotgun |
| barrel length | 28" |
| caliber/gauge | 12 Gauge |
| capacity | 4 + 1 |
| chokes included | F,M,IC |
| color | Black |
| length | 37.3000 |
| model | SX4 |
| package height | 3.0 |
| package width | 9.5 |
| product type | Shotgun |
| safety | Crossbolt |
| shipping weight | 9.7 |
| sights | TruGlo Fiber Optic Front |
| sights type | Fixed Sights |
Frequently asked questions
- Does this work with aftermarket choke tubes?
- Yes, but only with Winchester's Invector-Plus system—third-party options like Carlson's or Briley must specify this threading pattern. The threads are precisely cut to 0.812x32 TPI; avoid forcing non-compatible chokes to prevent barrel damage. Pattern new chokes at 40 yards to confirm zero shift.
- Can I use 2¾-inch shells in a 3-inch chamber?
- Absolutely—the chamber handles 2¾-inch, 3-inch, and 3½-inch shells (with modified gas system). Firing shorter shells creates no functional issues, but carbon buildup increases near the chamber step. Clean every 250 rounds when mixing shell lengths for reliable extraction.
- How long does shipping take to FFL dealers?
- Ironclad Armory processes orders within 2 business days, with transit times averaging 5-7 days via FedEx Ground. Your FFL must email their license to [email protected] before shipment. Delays occur if the recipient FFL hasn't provided current documentation.
- Is the synthetic stock weatherproof?
- The stock is molded from Zytel polymer with a matte black finish resistant to moisture and UV degradation. It withstands temperatures from -40°F to 160°F without cracking—superior to walnut in wet environments. The finish shows minor scuffs after 50+ field carries; apply Birchwood Casey matte spray for touch-ups.