The Winchester SX4 in 20 gauge with 28-inch barrel. Same Active Valve gas system as the 12-gauge version. Handles 2.75 and 3-inch loads interchangeably. Lighter weight makes it ideal for all-day upland hunting. Type: Semi-Automatic Shotgun Action: Gas-Operated Caliber: 20 Gauge Capacity: 4 Year introduced: 2018, USA Weight: 6.25 oz Overall length: 49" Status: Active Intended use: Field, Hunting, Upland