WHAT DOES REMINGTON 870 WINGMASTER 2 3/4 ONLY MEAN?

I need to find a barrel that is certainly for the wingmaster only? What duration will get me to unique and are there more time barrels obtainable? To who should I flip Other than ebay?KC but the other way up it claims CK. not even stamped all that effectively. As far as the rest of the serial on another , its S656868V. Way more high quality within