Originally Posted by ballardw
Since you mention more than one manufacturer, it is important to note that this statement is not true for all makes and models. For example, in the 1911 family the 45 frames will not work with 9mm/38 Super and such calibers as the ejector will not contact the case properly.
This is a good point. I'm primarily talking about Glock and Sig. More specifically 23 9mm conversion and P226 .40 9mm conversion.