As stated in above post I do not know specifics. It is the statement that drew question for me to research subject.The local shooter didn't explain the mechanical flaw?
Can you explain what you mean by "talked to optics reps"?
Do some research yourself get a list of specific difficult questions, and then call and talk to or ask for a call back from a product rep/tech from several scope manufacturers. A few of them I talked with would not give straight forward answers when asked direct questions about durability.