Hmmm... I'm pretty sure you can drop on parts to convert it to 38 Super - slide with barrel etc plus a magazine. Perhaps 357 SiG conversion as well... a 10mm conversion would be cool but I'm not sure that can be done - seems to me that the overall length of the 10mm Auto is more than 45 ACP. There is a hotshot 45 ACP conversion (nomenclature escapes me) around - basically uses cut-down 308 cases (heavier web and head) and is loaded to higher pressure - if you're serious, let me know and I'll dig up some info.