When carrying a firearm with a concealed carry license, the handgun must be completely concealed. Under Oklahoma State Laws it is illegal to carry a handgun larger than .45 caliber pursuant to the Oklahoma Self-Defense Act (licensed concealed carry).
When purchasing a handgun you must pass an Oklahoma State Bureau of Investigation background check. This could take 10 minutes or up to 7 days. There is no limit on the amount of handguns you can purchase.