Your Thoughts: M&P Shield "Keyhole" marks on primer

[rbeau30]

So I took the M&P Shield .40 out the other day first auto pistol I have owned beside AR pistols.

Fired some rounds to familiarize myself with the tool. I fired Federal Hydrashocks, Federal American Eagle FMJ, and some Hornady Critical Duty rounds. Sorting through the spent brass, I noticed that the primers had a keyhole mark left on them. Almost as though the firing pin was not retracting fully before the spent case was ejected.

A little worried that this will add some extra wear an tear on the firing pin, and I probably should have it looked at by S&W, but just wondering if anyone else had this issue with their Shields or any other handguns.

Figured this fits under the "Ask-a-Member and I need help with..." portion of the section.

I'll get pictures up when I get home, I was going to ask someone at work that has the same pistol I have but he hasn't fired his yet.