The Winchester SX4 Waterfowl Hunter in 20 gauge with Realtree Timber finish is a gas-operated semi-automatic shotgun that builds on the SX3 platform. The Active Valve gas system is the key mechanical improvement. It self-regulates to cycle different load pressures reliably, from light 2-3/4" target loads up through 3" hunting loads. At 6 lbs 12 oz, it's light for a semi-auto 20 gauge, which makes it easier to carry all day. 
 

Key Specifications 

• Brand: Winchester 
• Model Name: SX4 Waterfowl Hunter 
• Gauge: 20 GA 
• Chamber Length: 3 inches 
• Barrel Length: 28 inches 
• Overall Length: 49 inches 
• Weight: 6 lbs. 12 oz. 
• Capacity: 4+1 rounds (2-3/4" shells) 
• Sights: Fiber Optic Front Sight 
• Stock Type: Fixed Composite Stock with Realtree Timber Finish 
• Receiver Material: Aluminum Alloy 
   

Detailed Features 

 
The aluminum alloy receiver keeps weight down while offering adequate durability for field use. Invector Plus choke tubes let you swap patterns for different distances and game. The fiber optic front sight picks up quickly in low light, which matters during early morning or overcast waterfowl hunts. 
 
The fixed composite stock in Realtree Timber is trim and doesn't add unnecessary bulk. Winchester improved the balance slightly over the SX3, which most shooters notice when mounting the gun repeatedly over a long day. The 28-inch barrel in 20 gauge gives a good swing weight for moving targets.

The SX4 Gen 2 in Realtree Timber gets consistent praise for being light and reliable. Waterfowl hunters who've run it through wet, cold conditions note it keeps cycling where some competitors have given trouble. The semi-auto action earns the most positive comments. Smooth cycling with minimal perceived recoil makes follow-up shots easier.

The Realtree Timber camo pattern is well-liked aesthetically and practically; hunters comment it breaks up the outline well in natural cover.

The main counterpoint in user discussions is price. A few buyers feel similarly-performing semi-autos are available cheaper, and that Winchester's name carries some of the price. Some discussion also touches on recoil with heavier 20 gauge loads, where a minority of users prefer a heavier gun. Overall the sentiment leans positive, with most owners happy with the combination of light weight, reliable cycling, and the Timber camo finish.