I hate to dash your hope but this happened to me very recently. I had a standard weight 20 gauge Remington 1100 which came with a 28 inch full choke barrel. I contacted Remington to see if a replacement barrel could be purchased with the rem-choke installed. I supplied them with the serial number to assist them in determining the year of manuifacture. After four or five days I recieved a e-mail where they advised that the gun was made in 1977 and that none of their replacement barrels would work due to the slight changes made in the gas operated systems. I was lucky and located a used barrel in improved cylinder through a gunsmith it was not exactly what I wanted but it will do for now.