The Winchester SXP (Super X Pump) is a speed-pump shotgun featuring Winchester's Speed Pump action — a cam-assisted mechanism that allows the action to begin cycling before the shooter has completed a full rearward stroke. This enables significantly faster pump cycling than conventional designs. Type: Shotgun Action: Pump-Action Caliber: 12 Gauge Capacity: 4 Year introduced: 2009, USA Weight: 208 oz Overall length: 47.5" Status: Active Intended use: Hunting, Waterfowl, Sport