The Model 50 was Winchester's first semi-automatic shotgun, using an inertia-based floating chamber system designed by David Marshall Williams. It was technically innovative but more expensive to manufacture than competing gas-operated designs. Type: Shotgun Action: Semi-Automatic Caliber: 12 Gauge Capacity: 4 Year introduced: 1954, USA Weight: 86 oz Overall length: 47" Status: Discontinued Intended use: Hunting, Sport Shooting