The Winchester SX4 Upland Field is a 20-gauge semi-automatic shotgun with a 28-inch barrel, walnut stock, and nickel receiver finish. At approximately 6.8 lbs it handles well during a full day in the field, and the 3+1 capacity covers most upland hunting situations. 
 

Key Specifications: 

• UPC: 048702019005 
• Action: Semi-Automatic 
• Barrel Length: 28 inches 
• Capacity: 3 rounds (plus 1 in the chamber) 
• Finish: Walnut with a nickel receiver finish 
• Gauge: 20 GA 
• Weight: Approximately 6.8 lbs. 
   

Detailed Features: 

• Inflex Technology Recoil Pad: Reduces felt recoil by redirecting pad movement downward, which keeps the stock from driving straight back into your face and lets you get back on a second bird faster. 
• TruGlo Fiber Optic Sights: High-visibility in low-light early morning and evening conditions. 
• Invector Plus Choke System: Included chokes let you adjust shot patterns for different game and distances — tighter for longer passing shots, more open for close flushing birds. 
• Matte Nickel Aluminum Alloy Receiver / Walnut Stock: The combination holds up to field use while looking better than synthetic alternatives in the same price range.

Feedback on the Winchester SX4 Upland Pro 20 GA is mostly positive among upland hunters. The lightweight design and semi-automatic action get consistent praise — it shoulders quickly and the cycling is smooth across a range of loads. Ergonomics and fit get good marks from most users, with the adjustable features appreciated for getting the right length of pull.

The common criticisms are recoil management with heavier loads and occasional feeding issues with specific ammunition. The felt recoil feedback is worth noting given the Inflex pad is a marketed feature — lighter 20-gauge target loads cycle fine, but some owners pushing heavier field loads find the pad doesn't eliminate all of it. Reliability concerns appear occasionally but aren't the dominant theme. Pricing splits buyers: most feel the build quality supports the price, but some point to competing options that cost less.