The Winchester SX4 Waterfowl Hunter is a semi-automatic shotgun chambered in 12 gauge with a 3.5-inch chamber. The 28-inch barrel puts overall length at 49 inches; the gun weighs 7.20 lbs and holds 4+1 rounds. 
 

Key Specifications 

• Brand: Winchester 
• Model: SX4 Waterfowl Hunter 
• Caliber: 12 Gauge 
• Chamber Length: 3.5 inches 
• Barrel Length: 28 inches 
• Overall Length: 49 inches 
• Weight: 7.20 lbs (115.2 oz) 
• Capacity: 4+1 rounds 
• Sights: Truglo Fiber Optic Front 
• Stock Finish: Woodland Camouflage 
• Action Type: Semi-Automatic 
   

Features 

 
The SX4 carries a self-adjusting active valve system that cycles different loads without manual adjustment. The hard chrome-plated chamber and bore resist wear from heavy use. Three Invector Plus choke tubes let you adapt shot patterns to the situation. A spring-loaded ejector clears spent hulls reliably, and oversized bolt handle and bolt release work with gloved hands. The rounded grip with textured surfaces holds steady in wet conditions, and the reversible crossbolt safety covers left-handed shooters. Length of pull spacers allow a customized fit. Back-bored technology improves shot patterns by optimizing bore dimensions.

Waterfowl hunters running the SX4 in Woodland Camo generally come away satisfied. The gun cycles smoothly, handles different loads without much fuss, and carries light enough for long days on the water or in the field.

The camo finish is functional, not just cosmetic -- it blends reasonably well in marshes and natural cover. Owners also use it for upland birds and clay shooting, and the gun holds up across all three without demanding anything special from the shooter.

The main criticisms are minor: some users find it slightly picky about lighter ammunition, and a few note that taking it apart for cleaning is a little more involved than comparable semi-autos. None of that changes the overall picture, which is a reliable, comfortable gun that fits a wide range of hunting applications.