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”.
A true "Gun Guy" (or gal) should have familiarity and a modicum of proficiency with most all firearms platforms.
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