Your photos appear to show; slag, or crap milling job which wasn’t cleaned up in breechface, which you have circled in Red.
I’d dress that down/clean it up so you lose that kick up of cartridge off the breechface.

Also see a sliver of extractor body showing proud above breechface, which is also holding case head off of breechface.
It’s nearly microscopic though.
I would also dress this down to flush/just past flush.

Wager it will function fine in spite of this, but it isn’t “right”.