When Remington re-introduced the 1100 in 1987 and called it the 11/87 the gas system was modified but the shotgun basically remained the same except for cosmetic changes. The new 11/87 "sold" well even with a $125.00 price increase per shotgun. The marketing guys did their job well.
The growing popularity of Sporting clays in the early 90's changed the "bar" on the semi- automatic shotgun market and frankly put Beretta on the map.
Remington controlled the automatic shotgun market since the 70's and Beretta stoled it from them in less than 8 years with a better product.
The Beretta 303/390 is a lighter shotgun and a has much more reliable gas system.
Browning entered the fray with the Browning Gold which FN/Browning aquired the rights to redesigning the SX-1 after purchasing Winchester.
Browning needed a gas operated shotgun design which would remain in their product mix longer than 2 years.
John Rossioux (sp.) re-designed the Winchester super-X model 1 into the Browning Gold and Winchester SX-2/SX-3 as we know it today.
The origional Winchester super-X model one was the finest gas operated semi-automatic shot gun ever built in the USA. The Super-X shotgun was absolutely over engineered and over built. The Super-X equaled a Winchester model 12 with a gas system.
The Win Super -X has the first short stroke gas system and 100 % steel components except for the recoil buffer and the EASIEST AUTO shotgun to clean of them all.
John Satterwhite shot Win super-x shotguns before Benelli picked him up.
John needed the "fast" lock time the Super-X provided and I assure you it is fast. Almost close to a "3 shot burst".
My Brother has a Skeet shooting friend that has over 250,000 rounds through his Win super-X skeet gun and the only part he has replaced is the recoil buffer.
The sad part is Winchester built less than 95,000 of these fine shotguns which qualifies this fine blend of steel and wood as a total marketing failure. I will not get into that subject.
Reimington still owns the total production numbers for the semi-automatic shotgun market with the 1100/11-87 but they "gave" the opportunity for the European manufacturers to enter the U.S market with a re-designed shotgun and reverse Remington's market share in 10 years.
Once you loose market share you never get it back, at least with guns you don't.
Chocdog