This is a picture of my 5” M&P 2.0 40.
I’m not sure what the part is called unfortunately but I see a little mark which I’ve circled.
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This is the sear. It’s not a common wear.
Look at striker’s hook on the slide if this one doesn’t have any suspicious edges.
It may be also sear’s material defect.
Anyway, if this is a range firearm, you can probably shoot it still, until you find it more defective.
If this is your defense tool - go and replace the sear.
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This is currently set up as a home defense gun. I contacted S&W. Maybe they can help me out.
I don’t see anything abnormal. My only concern would be I replace it and then the same thing happens to the new sear.
I’ve been a bit disappointed with this gun. I carry a shield and I love that gun. I’ve had zero problems with it. I sorta wish I would have got the standard 4.5 inch or the compact as my second gun. But this could have potentially happened to any of them.
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@Scoutbob
Use your finger and touch the striker in the slide. If it’s nice without any sharp edges - all is good.
In that case I’d say it’s a material defect on the sear, so simple replacement will fix the issue and you won’t see such mark anymore.
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Striker seems fine. I’m going to see if S&W will send me the part with the warranty.
Darn, I was hoping I could use this as an excuse to convince
my wife to let me get a Glock 19.
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Are you serious? Nobody gives up M&P for any Glocks 
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Said Nobody.
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Oh I’m not giving up any of my m&ps… I might just add a gun… or 3 
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I’m not giving up my M&P for a Glock. Nope, not happening.
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So I sent the picture into S&W and they told me this is normal… any thoughts? They said this…
“I have reviewed your photo and this is normal. This is a mark from the MIM process. (This is a molded part)”
From a YouTube video:
I’d take it to a reputable gunsmith to have them check it out, @Scoutbob. Better safe than sorry.
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I’ve brought in the “experts” 
and asked them about the dimple, @Scoutbob. @KevinM and @Teddy are thinking it’s just an appearance blemish and shouldn’t hurt the functionality of your firearm at all.
How long has the firearm had that mark?
Thank you! This will sound silly, but I noticed it about 3 years ago. Shrugged it off, and forgot about it until now.
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3 years? and no issues? So nothing to worry about now. 
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I hadn’t shot the gun since then. It still has less than 1,000 rounds through it. I took a break from shooting. This was bought more of a play hobby. It’s now used for hone defense though.
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That’s weird. 1000 rounds and “This is a mark from the MIM process”? I’ve never seen such “blemish”, which is actually a “hole” in my live. Anyway, if you are comfortable with this look of that part - consider it as a trademark 
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It’s a simple fix.
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So S&W must have been correct. I just bought the full size in 9mm and this is what the seat looks like 
.
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Yeah unfortunately that is a MIM cavity formed in the process. It is not part of the bearing surfaces and quite frankly should not be an issue. That said I would replace said bit simply for piece of mind when the $$$ become available and keep it as a spare. I do not have much faith in MIM parts and avoid them at any time I can.
@Dawn a reputable gunsmith is like a reputable car salesman they exist but only by opinion. There are no sanctioning bodies and no standards and while there are a few schools NONE have any authority or stance in any venue. It’s like being a Doctor in 1900 you went to school (or not) and can fix some people some of the time.
Cheers,
Craig6
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