M&P 9mm Question

[James_Joshua]

My father recently purchased a S&W M&P 9C. While picking up the brass from the first range visit we noticed that the primers had a strange shape after firing. After field stripping we noticed that there is an interesting gouge underneath the firing pin hole. Not sure if it's a machining error or is intentional. It doesn't affect the function at all. What do you all think?

 

[Munsterf18]

My 9c looks identical to yours.

I have no problems with it.

Happy New Year!

 

[Spotteddog]

Mine does as well.
My guess (and it's only a guess?) is that it's to allow combustion debris to fall away from the breech face.

 

[buckspen]

M&P Breech Face

I have (and shoot) 9mm and .40 caliber full size M&P pistols. They both have that odd looking "trough" below the firing pin hole in the breech face. Don't know the purpose, but it was purposely put there.

- - - Buckspen

 

[James_Joshua]

Thanks. Wasn't sure if it was a CNC error or what. Thanks for the help.