Thanks for the feedback; I do not mean to cause you any frustration with the admittedly anecdotal experience that I related. I am truly interested in the problems that have occurred with others with their gen 4 40`s and value input from others that have see a lot more of them than I do. Information about the specific problems that others have seen would be helpful. I have had problems with the gen 4 19 that I have with the 0-3 spring (the same issues that Todd noted with the G17,) but so far my 40`s have been good. Thanks in advance for further input.