Those little barrel/Frame alignment marks
Are properly termed "witness" marks, as they provide witness to the fact that the barrel and frame are intact and no movement has occurred.
Sorry, but I really grow weary of folks using a lot of words to describe something that has a name. This is back to the "Buy books, read them and do your homework!" mantra that I am accused of belaboring...
Knowledge empowers; so does ignorance. Ignorance on your part empowers others to take advantage of you. Read and study and make field trips.
Tom A.
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