I think it was me who suggested the Apex DCAEK for your M&P. I bought a new M&P 45 with the 4" barrel last November and the gun's trigger was too heavy out of the box in my opinion. And, of course, it had the usual M&P gritty pre-travel as well. So an armorer who works at the shop installed the DCAEK and when I got home, I measured the trigger weight to find that it was at 6.5 pounds. Still a little too heavy for my likes and after doing some dry firing and thinking about it. I removed the DCAEK trigger spring and re-installed the factory OEM spring. This took the trigger pull weight down to around 4 pounds 14 ounces and with the nice clean break, this works for me just fine.