Its unique that ruger only made the fluted cylinders for their 5.5"version of Super Blackhaws.Mine is identical.It makes them look like Blackhawks,but they are truly Supers,just a little lighter,which I think is a plus.Of course their magnum Vaqueros have fluted cylinders as well,just think its unique that only the 5.5"length Supers came standard like this.Just a small anomily that make gun collectors years from now to go nuts$$$$ over....GLWS