The Winchester SX4 is a 12 GA semi-automatic shotgun with a matte black finish and a 3.5-inch chamber. The 28-inch barrel gives an overall length of 49 inches, and the gun weighs 7.20 lbs. Capacity is 4+1 rounds with 2-3/4-inch shells. Length of pull is 14-1/4 inches with a 1-3/4-inch drop at comb. Includes Full, Modified, and Improved Cylinder Invector-Plus chokes. 
 

Key Specifications 

• Brand: Winchester 
• Model: SX4 
• Caliber/Gauge: 12 GA 
• Barrel Length: 28" 
• Overall Length: 49" 
• Weight: 7.20 lbs. 
• Chamber Length: 3.5" 
• Capacity: 4+1 rounds (2-3/4" shells) 
• Sights: Truglo Long Bead Fiber Optic Front 
• Stock Material: Composite with grip panels 
• Finish: Matte Black 
   

Detailed Features 

 
The semi-auto gas action cycles without manually working the action between shots, which helps with follow-up shots on moving targets. The Inflex Technology recoil pad redirects felt recoil downward rather than straight back, which many shooters find reduces perceived recoil on heavier loads. 
 
The 3.5-inch chamber handles everything from light 2-3/4-inch target loads up to 3.5-inch magnum waterfowl loads. The Invector-Plus choke system includes Full, Modified, and Improved Cylinder tubes. The Truglo fiber optic bead improves visibility in low-light conditions. 
 
The composite stock has textured grip panels and adjusts for 14-1/4-inch length of pull with 1-3/4-inch drop at comb. The aluminum alloy receiver holds weight to 7.20 lbs. 
 

Usage Scenarios 

1. Waterfowl Hunting: The 3.5-inch chamber opens up high-velocity steel and bismuth loads for longer passing shots. 
2. Upland Hunting: The 28-inch barrel and lighter modified/IC chokes cover most upland bird scenarios. 
3. Sport Shooting: The cycling action and Inflex pad handle the volume of shells in trap and skeet sessions without punishing the shooter.

Owners of the Winchester SX4 12 GA 28-inch consistently mention a few themes.

The matte black finish gets positive comments for reducing glare in the field, and owners note the composite stock holds up well in wet conditions compared to wood alternatives.

Reliability and smooth cycling draw the most praise. Most owners report the action feeds cleanly across different 12 GA loads once the gun has been properly cleaned, and the gas system handles both light target loads and heavy magnum shells without much adjustment.

Recoil management comes up frequently as a positive. The Inflex pad is mentioned by name and is credited with making longer range sessions and magnum loads noticeably more comfortable.

Ergonomics are generally well-regarded. The grip and stock dimensions work for most shooters, and the adjustable length of pull is mentioned as a practical feature.

On the critical side: a few users note the 7.20-lb weight is noticeable on longer field days. Some shooters report a short break-in period with very light target loads before the action cycles reliably. The factory choke selection is considered adequate but limited compared to aftermarket options.