My Son-Inlaw has a M&P Shield that I tried out and I was able to dry fire pull the trigger with no problem at all. Now all I got to do is find someone that would want to trade a M&P Shield for a 3rd Gen S&W model 908 w/3 mags and original case plus paperwork.
Good to go! A striker-fired gun was one of the options I listed.
You'll be better off selling the S&W 908 and using the money to purchase a Shield.