I just updated my 3913 with fiber optic front sight to help my old eyes and has been my summer carry for many years. However my newly acquired 5903 SSV has become the new summer carry in a lot of situations. Winter carry has been updated from 4566/4006 to a M&P 2.0 5" 9mm. I tried to replace the 3913 with a Shield and a M&P Compact 2.0 but the 3913 still shot better.