Winchester SX4 | 20 Gauge | 26 in | Synthetic | MFG# 511205691

The Winchester SX4 is a 20-gauge semi-automatic shotgun built with a matte black synthetic stock and ergonomics intended for extended field use. It pairs a 26-inch barrel with Invector-Plus interchangeable choke tubes and a Truglo fiber-optic front sight for clear sighting in changing light. The SX4’s features emphasize reliable function across a variety of loads and user-adjustable fit for hunting and sporting-clays applications.

Product Specifications

• The manufacturer is Winchester.
• The model is the SX4.
• The gauge is 20 Gauge.
• The barrel measures 26 inches.
• The chamber accepts a maximum 3″ shell.
• The action type is Semi-Auto.
• The stock material is synthetic in a matte black finish.
• The overall length is 47 inches.
• The weight is listed as 6.63 lbs.
• The front sight is a Truglo fiber-optic bead.
• The choke system is Invector-Plus (F, M, IC).
• The recoil pad is Inflex Technology for reduced felt recoil.
• The receiver material is aluminum alloy.
• The magazine type is a tubular magazine and a 1 × 4-round magazine tube is included.
• The UPC is 048702009952.

The SX4 blends modern autoloading function with user-focused ergonomics: a thinner, more pointed grip and textured panels improve handling and pointability in the field, while the self-adjusting valve system helps cycle a wide variety of loads. Its features make it suitable for upland hunting and sporting-clays where quick handling and consistent patterns matter.

Users commonly praise the SX4’s improved ergonomics and comfortable handling, and many note reliable cycling across a broad range of loads as a strong practical benefit.