I appreciate the clarification on nothing is wrong with these sights, period. The marks are factory stating they are a 6.1mm sight like original G45 rear sight which is also marked 6.1mm. I googled Ameriglow GL-5113 sights and they show these marks. Learn something new every day....
The nylon punch did do it's job, but yes it did chip or mar itself while hitting with a hammer (maybe that's why 5 in a package). Soft? Possibly.... And I contacted Amazon to have them remove the negative feedback I left.
Again, thanks forum members for setting the record straight. I hate nothing more than misinformation......