Taurus PT92/99 wear

[YetAnotherSam]

I have a Taurus PT-99 that I picked up used, and I know nothing of its history. This is same as a PT-92, but with adjustable sights. I am pleased with it, but I am concerned about some wear on the locking block. The two ears that stick out and contact the slide have the corners rounded off a bit. From the design of the piece, it is obvious that this type of wear is inevitable.

It looks like the worst failure would be a failure to extract, and it would fail with the breech locked. Anyone have any experience with this sort of thing? Is this the result of "breaking in" or "wearing out"?

Sam