If you are referring to the two small chips/dings at the right side, I haven’t noticed anything like that with the P320s I’ve worked with even after several thousand rounds.
If it were my gun, I’d monitor it and if it got worse, I’d contact SIG about getting the sear replaced. If, however, it didn’t change I personally wouldn’t worry about it. Minor defects like that in metal parts are not unknown.
I can tell at sight a Chassepot rifle from a javelin.
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