M&P 40c - odd primer strike?

[Sprocket]

Working the kinks out of my new 40c - started picking up the brass and found what I would call really odd looking pattern on the brass.

It's sort of a 4 sided diamond pattern - see attached pic.

Question:
Is this normal - I'm used to the nice small dent without the scrape marks, etc.

 

[HTRN]

That's how mine look from the 40c.

 

[eisenhow]

It's an M&P thing. My 9mm M&P does the same thing.

 

[HiggityHank]

Same thing happens with all of mine in a 40 and a 40c.
It's an M&P thing.

 

[drgrant]

All (Or at least, a considerable number of) striker fired handguns do this. Glocks, M+Ps, etc. It's because the pin itself is more of an "angled point" than it is a round-style firing pin.

-Mike

 

[Sprocket]

Ah! Now it makes sense - Thank you all for your help