another reason...no money..remember Groups were 'going away' in the 70's and things didn't start turning around til the mid 80's.
I'd guess another reason is that most of us had no experience with wpn optics except for sniper systems....what you don't know is what you don't know.
Lastly, this buying 'off the shelf' is a relatively new attitude and did not exist years ago...we only got away with so much 'non issue' stuff...sounds lame now I know but I suspect that was some of the reasons why.
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