The first Model 1100s came out of the factory in 1963 and were available in several versions, all of them 12 gauge ... drop in Model 1100 sales was likely anticipated by Remington.

icollector.com Remington’s gas-operated 1100 changed the semi-auto shotgun game when it debuted ... by an overwhelming number of duck hunters because it was the first 12-gauge auto-loader that could ...