So, purchased for my wife a P320 Subcompact. I decided, that for me, I would like to have a .357 Full Size, so I bought the X-Change kit. In the process of shooting at the range, I kind of fell in-love with the little bugger. I have ginormous hands, so my favorite is my P226 Tacops. Well, I thought that I could be slick and get myself a Compact grip, and a magazine, and I would be off. Well, it appears that the Compact uses a different slide and barrel than the Sub-compact, as well as a different slide and barrel than the Full-size. IS this true? Is there anywhere to get a slide and barrel without the entire Exchange kit?