A friend recommended an interesting way to test the relative power of strikers. Unload your gun, of course. No live ammo around. Cock your unloaded pistol, point the pistol straight up, and insert a pencil in the barrel with the eraser side down. Pull the trigger and watch the pencil move.
I did this with both of my M&Ps and the pencil only moved about an inch. The pencil never even came close to leaving the barrel.
When I tried this with my STI Sentry (45) the pencil launched from the barrel and almost stuck in the drop ceiling in my basement.
No wonder I get light primer strikes in my M&P when I use hard primers like Remingtons, CCIs, or Magtechs.