I want to do as well, Procure a S&W M&P 40c. Do a M&P (Aluminum/Polymer) Action Enhancement Trigger and M&P Duty/Carry Action Enhancement Kit. test it at the range through each enhancement. Then 9mm for the range, 357sig for accuracy, 40sw for defense. Having a problem deciding what setup to stay with most of the time. will decide that after I put a few thousand rounds through it in each setup. I have time, I am Retired. This is not Rocket Science (Worked 34 years on the Shuttle plus 13 on the International Space Station) cut my teeth on a Galloway trigger job, on a BG380. How hard could it be??