The Oklahoma Second Amendment Association (ok2a.org) has handouts concerning,
"New and Existing Gun Laws Pertaining to Open or Concealed Carry of a Handgun In Oklahoma On and After November 1, 2012".
OKOCA also produced a like pamphlet that can be carried in ones pocket or wallet.
These pamplets give the most important changes to the laws of open carry.
When approached by Leo's or citizens they can quote the title and sections to which they pertain.