The Winchester SX4 is a 12 GA semi-automatic shotgun in matte black with a 28-inch barrel, 3.5-inch chamber, 4+1 capacity, and 7.2 lb. weight. This is the left-hand configuration. The Inflex Technology recoil pad, Truglo fiber optic front sight, and Invector-Plus choke system are the main practical features. 
 

Key Specifications 

• Model: SX4 
• UPC: 048702018718 
• Gauge: 12 GA 
• Action: Semi-Automatic 
• Capacity: 4+1 rounds 
• Barrel Length: 28 inches 
• Overall Length: 49 inches 
• Weight: 7.2 lbs. 
• Chamber Length: 3.5 inches 
• Finish: Matte Black 
   

Features 

The Inflex recoil pad redirects the stock downward on firing, which reduces felt recoil and helps you get back on target faster. The Truglo fiber optic front sight is bright in low-light conditions. The Invector-Plus choke system takes full, modified, and improved cylinder tubes for adapting to waterfowl, upland birds, or clay sports. The aluminum alloy receiver with composite stock keeps the overall weight at 7.2 lbs. -- manageable for a 3.5-inch capable semi-auto. Left-hand controls are a practical feature for left-handed shooters who often can't find suitable options. 
 

Who It's For 

Left-handed hunters and sport shooters who want a reliable 12 GA semi-auto. Intermediate to advanced shooters will appreciate the choke versatility and the 3.5-inch chamber for heavy loads. 
 

Uses 

• Upland bird and waterfowl hunting 
• Clay target and skeet shooting 
• Home defense, where the semi-auto action and reliable operation are practical

The SX4 LH earns strong marks for reliability -- most owners say it cycles consistently across loads, and the left-hand configuration is a specific selling point that left-handed shooters repeatedly mention. The 28-inch barrel gets credit for a good balance of maneuverability and accuracy. Ergonomics are comfortable for most, with easy-to-reach controls. The recoil management system is noted as a genuine improvement for extended shooting sessions.

Some users mention the weight at 7.2 lbs. can become noticeable during long carries. Occasional ammunition-specific cycling issues appear in a minority of reviews. Aesthetics are mostly well-received, though some users want more finish or accessory options. Customer service experiences vary. Overall, the SX4 LH is well-regarded for performance and the left-hand configuration specifically.