The SX4 is Winchester's current-generation inertia-operated semi-automatic shotgun, manufactured by FN Herstal in Belgium. The 12-gauge Field model with 26 or 28-inch barrel uses a simplified four-component inertia system for reliable cycling with loads from 2.75-inch target loads to 3-inch magnums. Type: Shotgun Action: Semi-Automatic Caliber: 12 Gauge Capacity: 4 Year introduced: 2017, Belgium Weight: 192 oz Overall length: 47" Status: Active Intended use: Hunting, Field, Upland, Waterfowl