I've checked my stingray, and I have those mark, but they aren't as pronounced as yours. Who knows, they might look identical in real life, and the depth of yours is a trick of the light. Shoots great, maybe I wore it down after a few hundred rounds.
The cz p01 I saw awhile back had tons of tooling marks and the frames weren't polished much on the internals. I assume is because they'll let the gun smooth out and polish the internals to get a really tight fit.