The Winchester SX4 in 20 gauge brings the Active Valve gas system to a lightweight field platform. The 20ga SX4 is notably lighter than the 12ga version while retaining the same gas self-adjustment capability, making it a strong contender for upland hunters who want an all-load semi-auto. Type: Semi-Auto Shotgun Action: Gas-Operated Caliber: 20 Gauge Capacity: 4 Year introduced: 2017, Belgium/Japan Weight: 6 oz Overall length: 47" Status: Active Intended use: Field, Hunting, Upland