The Stoeger M3500 20ga is a 20-gauge inertia semi-auto with a 3-inch chamber. Synthetic or camo stock, three choke tubes, and the same Inertia Driven system as the 12-gauge variants. A budget-priced entry into the 20-gauge semi-auto category. Type: Shotgun Action: Semi-Automatic Caliber: 20 Gauge Capacity: 4 Year introduced: 2018, Turkey Weight: 83.2 oz Overall length: 46" Status: Active Intended use: Hunting