The Remington 1100 shotgun was originally designed by Wayne Leek and was first produced in 1963 as the successor to the Model 58 and 878. The 1100 can be found in just about every available gauge and was also considered “the” Skeet gun of its day. There have been more than four million sold.
The Remington 1100 is probably one of the first viable gas-operated semi-auto systems when it comes to shotguns. Being gas operated also gives the gun a much gentler recoil when compared to other shotguns. The only real weak point in this platform is that it uses rubber o-rings in the gas system, versus metal on metal or a self-cleaning system. These o-rings are liable to dry rot or tear which means that your semi-auto won’t stay that way for long if they are not periodically checked and serviced. Newer updates and versions of the 1100 have moved on to use pistons in their systems to remove this flaw.
The Remington 1100 can use a variety of different sized barrels, that can also be rifled or smooth-bore depending on what you are shooting. The 1100 is a great low price option for close-range hunting, skeet, and trap shooting. Many have also used them as a budget-friendly option for getting into 3-gun competitions. The 1100 is slightly heavier than some modern shotguns but the weight has never really bothered me.