I'm debating on my next model purchase. I just picked up a new G26 for the wife last week, and after shooting that and my buddies G19, I want one of these compact/sub-compact smaller caliber models. I currently have a G30, and LOVE it. The G19 fits real nice in my hand, so that is the frame I want. However, I want something in .40S&W. So, on to my questions: 1. Is the G23 the model that you can easily swap in factroy 9mm, .40S&W, and 357sig barrels in? 2. Or is that the 27? I'm looking for something that will give me the versatility of shooting multiple cartages from one unit, in a compact size. Basically, I plan on covering 5 calibers with only two Glocks: 30 for .45acp and 10mm; G23/27 for 9mm, .40S&W, 357sig). Any help is appreciated.