The Winchester SX4 is a 20 GA semi-automatic shotgun with a matte black finish. The 28-inch barrel gives an overall length of 49 inches, and the gun weighs 6 lbs 12 oz. Capacity is 4 rounds in a 3-inch chamber. Included choke tubes work with the Invector-Plus system. 
 

Key Specifications 

• Model: SX4 
• Caliber: 20 GA 
• Action Type: Semi-Automatic 
• Barrel Length: 28 inches 
• Overall Length: 49 inches 
• Capacity: 4 rounds (3" chamber) 
• Weight: 6 lbs 12 oz (108.8 ounces) 
• Finish Color: Matte Black 
• Manufacturer: Winchester 
   

Detailed Features 

 
Back-Bored Technology opens the bore slightly larger than standard, which reduces friction on the shot column and produces tighter, more consistent patterns. The chrome-plated chamber and bore resist corrosion and wear over extended use. 
 
The Invector-Plus choke tube system lets you swap chokes to match the target distance and shot size you are running. The Truglo fiber optic front sight gives a clear reference point in low-contrast conditions. 
 
The synthetic stock has a textured grip surface that stays secure in wet conditions. The matte black finish cuts glare in the field. 
 

Usage Scenarios 

1. Bird Hunting: The 28-inch barrel and interchangeable chokes cover most upland and waterfowl situations. 
2. Clay Shooting: Back-Bored Technology and consistent patterns make it competitive at trap and skeet. 
3. Home Defense: The semi-auto action and 3-inch chamber handle a range of defensive loads.

Owners of the Winchester SX4 Matte Black 20 GA consistently highlight a few points.

Weight and recoil come up first. At 6 lbs 12 oz, the SX4 is light for a semi-auto shotgun, and shooters report the 20 GA recoil is genuinely comfortable over long sessions. Both new and experienced shooters mention this as a strong point.

Reliability is frequently praised. The gas-operated semi-auto action cycles cleanly with most 20 GA loads once the gun is properly cleaned and lubricated.

Build quality gets positive marks. The matte black finish and synthetic stock hold up well in field conditions, and the chrome-lined bore is cited as a durability plus.

Versatility with different choke and shot combinations comes up regularly. Waterfowlers and clay shooters alike appreciate the Invector-Plus system.

Some users mention a break-in period with lighter target loads, where the action can be slightly sluggish until the gun wears in. A few also note that the factory choke selection is adequate but limited compared to aftermarket options.