The .410-bore 1100 is the smallest gauge in the 1100 lineup — a gas-operated semi-auto .410 that has no equivalent from any other major manufacturer in production. The 25-inch vent-rib barrel is the standard configuration. Type: Shotgun Action: Semi-Automatic Caliber: .410 Bore Capacity: 4 Year introduced: 1969, USA Weight: 174 oz Overall length: 44.5" Status: Active Intended use: Hunting, Clay Sports