Does the 1100 Special Field take regular 1100 barrels, or is it's configuration like that of the 870 Special Field, where the barrels are not interchangeable with those of a standard 870? The reason I ask is that I saw a nice 1100 S.F. for sale, but would also like to use it with a 28" barrel. Remington website only states that 1100 barrels are not interchangeable with 11-87 barrels, and vice versa. Thanks for the info!