Know what sets the trigger break weight on an M&P?
I have an M&Pf 9mm that has a trigger pull of 5.5 lbs, well, 5-1/8 lbs now that I installed the APEX DCAEK, but that's another thread - already posted in fact. My M&Pf .45ACP has an 8 lb trigger.
So as I installed the DCAEK in my 9mm, I looked to see why/how the two guns could have two different pull weights - simple, it's the springs, right? Negative, it isn't the springs it's the angle of the trigger bar ramp that operates the sear!
It's much like the way the Glock connectors change the trigger break weight. Obviously springs can change the weight as well, but the difference in my 5.5 lb and 8 lb trigger weights is because they have two different trigger bar ramp angles.