I have read everything with regards to this die and nobody really points out the difference between the above die and the stand-alone M-die. The expander on the MEPCD is hollow for the powder drop and I believe the M-die is a solid expander plug. Correct? How do they stack up against one another? I bought a used 9mm Luger, Lyman Premium carbide 4 die set (#7680203) off of Ebay and instead of the M-die there was a MEPCD die in its place. My problem in that I didn't ask the right questions and based my buying decision off the listed set number. I don't have a problem with the switch if the MEPCD works as well as the M-die. I don't even know if the expander in the die set is for a 9mm in that I can't get the damn thing out. I could use some help with the removal process. Paperwork is somewhat vague. So . . for those of you that have used both please give me your opinion.