I believe that is the port where they purge the oxygen and then fill it with nitrogen so the glass won't fog internally. If you pull it the seal is broke. With the wear marks on it they either sent it back for service or pulled it themselves for who knows what. All my Vortex scopes have angled plugs so it's not uncommon..and looking at online pics of that scope they are as well. I would just leave it alone and try to enjoy it....hopefully it works for you.
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