The Remington Model 1100, introduced in 1963, revolutionized autoloading shotguns by combining the reliability of early-century models with the sleek lines and handling of double barrels. Renowned for its balance, durability, and reduced recoil due to its gas-operated mechanism, the Model 1100 became a favorite among American shooters. This shotgun operates by bleeding off gases through ports in the barrel, driving a steel action sleeve that cycles the action, ejecting the spent shell and loading a new one from the magazine. The standard Model 1100 can handle 2 ¾-inch shells, while Magnum versions can interchangeably fire both 2 ¾-inch and 3-inch shells. Available in multiple gauges, including 12, 20, 28, and .410 bore, the Model 1100 offers versatility with barrel lengths of 26, 28, or 30 inches, catering to various shooting preferences and applications. Its legacy is marked by its status as the best-selling autoloading shotgun in U.S. history by 1983, showcasing its enduring popularity and impact on American shotgun design.