S&W m&p has rough trigger "takeup"

[Haycreek]

My M&P 45 acp pistol has exceptional rough trigger takeup, very gritty. The trigger is completely smooth with the slide off. I have smoothed the safety disconnect to no avail. I have also detail stripped the assymbly containing the sear. everything looks very smooth, I did polish the round end of the sear where contact is made. Any help is appreciated. Not the pistol that the generation three is.

 

[AZ_Rebel]

What you are probably feeling is the Firing Pin Block Spring being compressed in the Firing Pin Block as you take up the slack. Try polishing/chamferring the seat in the block where the spring resides and reducing the length of the spring itself.

 

[pingpingping]

You are feeling the "squareness" of the firing pin block...you need to polish it round.There are threads explaining how to do this on the m-p pistol forum. These are super-easy guns to do trigger work to. There also may be an aftermarket part available from apex tactical.

 

[Haycreek]

Thanks, I had already polished and rounded the f/p block, perhaps not enough. Also polished the complete block. I still agree that this has to be the problem, I've rounded it twice, -- a little at a time. Thanks again.