Bar-Sto offers 9x25 Dillon, 40 S&W, and 357 Sig barrels for the 4.5" 10mm XDM, which is what I have. All of these are calibers I'd like to own in a full sized handgun, and considering how much I like my XDM, I think it would make sense to pick up these barrels and have a kick ass multi caliber system. It would also be far cheaper than buying three more XDMs. Now, I know the 9x25 is a simple conversion. All you need is a barrel. The 10mm springs (especially mine since I upgraded to some heavier springs) and the 10mm mag will work just fine with 9x25. 40 S&W and 357 Sig is what I'm not entirely sure about. I assume they would need lighter springs (which are cheap enough to buy), but I am not sure about the mags. Factory XDM 40 and 357 mags will not fit the 10/45 frame XDMs. Should unmodified 10mm mags work just fine?