Okla. Stat. tit. 20 § 1103F
A member of the Uniform Retirement System for Justices and Judges may receive credit for those years of credited service accumulated by the member while a member of the Oklahoma Firefighters Pension and Retirement System, the Oklahoma Police Pension and Retirement System, the Oklahoma Law Enforcement Retirement System, the Teacher's Retirement System of Oklahoma or the Oklahoma Public Employees Retirement System, if the member is not receiving or eligible to receive retirement credit or benefits from said service in any other public retirement system. To receive the service credit, the member shall pay the amount determined by the Board of Trustees pursuant to Section 1103G of this title. Said service of the member shall not alter the member's vesting requirements. The service will be added after the member reaches vesting date.
Okla. Stat. tit. 20, § 1103F