According to the Oklahoma Self Defense Act, title 21 1290.8 E. "Nothing in this section shall be construed to authorize a law enforcement officer to inspect any weapon properly concealed without probable cause that a crime has been committed"
The teacher of my CC class told us to memorize this and keep a copy of the book with us in case of such a request. Although If asked, I would probably hand it over, but let the officer know he was breaking the rules in doing so.
Kind of seems like that is counter productive. "Ok officer I'll give hand you my gun... But you know... you're breaking the law." Personally, I would just comply.