Multiple caliber firearms are a better idea in theory than in practice. Having played that game, I eventually decided I really wasn't saving much money or gaining much appreciable practicality. I now see it much like an adjustable suspension on my sports car. It's a neat idea to think I CAN crawl under my car and adjust my suspension to different settings, but the NEED to perform the task seldom comes up often enough to justify the cost & effort. IMHO, Just buy the (complete) pistol that you want & be done with it.