My LGS has a special on the M&P 9C and full size. The issue is I've read about the bad triggers in the current M&Ps and the fact that S&W is in the process of putting in the Shield triggers into all new M&Ps starting with the M&P 45C and eventually putting them into the 9C. Can the trigger in the older M&Ps be swapped out for a new trigger which will be installed in the new M&Ps or should I just bite the bullet and put in an Apex system?