Okla. Stat. tit. 21 § 1289.12
It shall be unlawful for any person within this state to knowingly sell, trade, give, transmit or otherwise cause the transfer of rifles, shotguns or pistols to any convicted felon or an adjudicated delinquent, and it shall be unlawful for any person within this state to knowingly sell, trade, give, transmit or otherwise cause the transfer of any shotgun, rifle or pistol to any individual who is under the influence of alcohol or drugs or is mentally or emotionally unbalanced or disturbed. All persons who engage in selling, trading or otherwise transferring firearms will display this section prominently in full view at or near the point of normal firearms sale, trade or transfer. Any person convicted of violating the provisions of this section shall be punished as provided in Section 1289.15 of this title.
Any person convicted of a violation of this section after having been issued a handgun license pursuant to the Oklahoma Self-Defense Act shall have the license suspended for six (6) months and shall be liable for 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.
Okla. Stat. tit. 21, § 1289.12