Okla. Stat. tit. 21, § 1289.10

FURNISHING FIREARMS TO INCOMPETENT PERSONS It shall be unlawful for any person to knowingly transmit, transfer, sell, lend or furnish any shotgun, rifle or pistol to any person who is under an adjudication of mental incompetency, or to any person who is mentally deficient or of unsound mind. Any person convicted of a violation of the provisions of this section shall be punished as provided in Section 1289.15 of this title. Any person convicted of a violation of the provisions of this section after having been issued a handgun license pursuant to the provisions of the Oklahoma Self-Defense Act shall have the license suspended for a term of six (6) months and shall be subject to an administrative fine of Fifty Dollars ($50.00), upon a hearing and determination by the Oklahoma State Bureau of Investigation that the person is in violation of the provisions of this section.