I disagree, but just for the sake of conversation, I’ll partially agree.
Blemishes do exist on the manufacturing process and they can be super tiny to the naked eye but visible when you magnify them with a day scope. They’re perfectly acceptable and it will happen.
Blemishes from abuse are rare on a 30 unless you have a bad unit or your shooting on something larger than 50 cal. However, a scar can and will mess up a clipon in a heart beat, so avoid using it on one. Oh, and avoid using it like a hammer. Otherwise, if you’re abusing a 30, there’s probably bigger problems in your life bc it’s extremely hard to mess them up.