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Could it be the trigger bar doesn't engage the FP plunger enough before the sear releases the striker? Looking at the side of some M&Ps it often doesn't really look like the trigger bar is far enough back to fully push up the plunger. If you rounded the plunger and didn't remove material from the sear for overtravel reduction (where it engages the trigger bar) I could see how this could be more of an issue.



Another simple way to look at it is if the trigger breaks early (as opposed to closer to the end of the trigger stroke as with sear overtravel reduction) there could be a chance that the plunger isn't fully clear of the FP causing a light strike. Is this making sense?



I've read a lot of posts but it's not clear what S&W has done to remedy this when people have sent the gun back.
 

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lugnut said:
Could it be the trigger bar doesn't engage the FP plunger enough before the sear releases the striker? Looking at the side of some M&Ps it often doesn't really look like the trigger bar is far enough back to fully push up the plunger. If you rounded the plunger and didn't remove material from the sear for overtravel reduction (where it engages the trigger bar) I could see how this could be more of an issue.



Another simple way to look at it is if the trigger breaks early (as opposed to closer to the end of the trigger stroke as with sear overtravel reduction) there could be a chance that the plunger isn't fully clear of the FP causing a light strike. Is this making sense?



I've read a lot of posts but it's not clear what S&W has done to remedy this when people have sent the gun back.


I can't comment on the above but I will say that certain ammo is more prone to causing light strikes than others. S&B being one. Very hard primers. I no longer shoot S&B ammo in any of my guns.
 

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You are correct it can be a problem, although I haven't seen it yet, the potential is there. The MPA's and a few MPB had the original striker that sometimes gave light strikes, S&W changed the design to increase spring pressure.
 

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I had three light strikes in 200 rounds fired yesterday. These are my reloads that have been 100% reliable in my 1911s for tens of thousands of rounds.



The M&P seems really weak on the striker blow. My 1911s will shoot a pencil completely out of the barrel, and my M&P 45 moves the same pencil about 2".
 
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