I just purchased used a tool head that had a bunch of RCBS dies.  Also included was the following Dillon die

Its a .40 cal crimp die.  The reason I'm posting here is that I have a 3 die set in .40 cal that I orginally bought from Dillon and the crimp die that I have looks nothing like this.  The barrel at the bottom spins all the way to the top.

I need to know what this is.  Thx - Roger