Why is it that so many seem to think that as soon as they get an M&P the first thing that they have to do is put APEX parts into it? I have no problem with APEX....why not take the money that the parts would cost you and buy more ammo and give it a trigger job one round at a time. Has worked on all 4 of mine.
My M&P .40 Full size has over 15,000 rounds down range and it just keeps on getting better and better. I have never changed the recoil spring or any magazine springs either. Seems many are near phobic about that as well. If I am having problems THEN I address it.
Just puzzles me.....
Randy