The Winchester SX4 Waterfowl Hunter is a semi-automatic 12-gauge shotgun with a 28" vent rib barrel, 3" chamber, 4+1 capacity, and 7 lb. weight. The finish is Realtree Max-7 camouflage across the stock and barrel. Overall length is 49". 
 

Key Specifications 

• Model: SX4 Waterfowl Hunter 
• Caliber: 12 GA 
• Capacity: 4+1 rounds 
• Chamber Length: 3.0 inches 
• Barrel Length: 28 inches (Vent Rib) 
• Overall Length: 49 inches 
• Weight: 7 lbs. 
• Finish: Realtree Max-7 
• Stock Material: Synthetic 
• Muzzle Type: Invector Plus Adjustable Choke 
   

Features 

 
The semi-automatic action cycles without the manual pump stroke, which matters during fast passing shots on ducks or geese. The Inflex Technology recoil pad redirects the stock's movement downward during cycling, which reduces muzzle rise and felt recoil compared to a straight recoil pad design. The reversible safety button can be switched for left-handed operation. 
 
The fiber optic front sight is visible in low-light conditions — useful for early morning or late evening hunting. The Invector Plus choke system accepts a range of tubes for pattern adjustment. The 3" chamber handles standard and heavy waterfowl loads. 
 
Realtree Max-7 is a newer camo pattern designed for marsh, flooded timber, and open water environments with a brown/tan/gray color profile. The SX4 Waterfowl Hunter is set up for duck and goose hunting use.

The SX4 Waterfowl Hunter in Max-7 camo draws favorable reviews from duck and goose hunters who run it in the field. Reliable cycling through varying waterfowl load weights is the most consistently cited positive — the SX4 action handles lighter target loads and heavy steel or bismuth loads without requiring adjustment.

The Inflex recoil pad is specifically mentioned by owners as doing what it is supposed to. Felt recoil with 3" loads is reported as noticeably manageable compared to similar-weight guns without the feature. The Max-7 camo gets good marks for the environments it was designed for.

At 7 lbs. the gun is comfortable to carry and hold for extended setups. Some owners note that disassembly for cleaning takes a bit of practice to become routine, which is a common comment for semi-autos generally. Weight is occasionally mentioned for very long days, though most find 7 lbs. reasonable for this type of shotgun.

Value relative to the Browning Maxus (effectively the same gun under a different brand) is a common discussion point — the SX4 typically comes in at a lower price for the same mechanical platform, which most buyers consider an advantage.