The Winchester SX4 is the fourth generation of the Super X semi-automatic shotgun line. Active Valve gas system self-regulates for loads from 2.75 to 3.5-inch shells. 28-inch vent-rib barrel, Invector-Plus choke system. Lightweight alloy receiver. Type: Semi-Automatic Shotgun Action: Gas-Operated Caliber: 12 Gauge Capacity: 4 Year introduced: 2017, USA Weight: 6.75 oz Overall length: 49" Status: Active Intended use: Field, Hunting, Sport Shooting