There are many courses offering online handgun training. Only OnlineHandgun.Training is approved and recognized by the state of Oklahoma.
Out of state handgun courses ARE NOT LEGAL in the State of Oklahoma. Furthermore, reciprocity is not a guarantee when you obtain an unapproved permit.
TITLE 21 § 1290.14 SAFETY AND TRAINING COURSE
Each applicant for a license to carry a concealed or unconcealed handgun pursuant to the Oklahoma Self-Defense Act must successfully complete a firearms safety and training course in this state conducted by a registered and approved firearms instructor as provided by the provisions of this section or from an interactive online firearms safety and training course available electronically via the Internet approved and certified by the Council on Law Enforcement Education and Training. The applicant must further demonstrate competence and qualification with an authorized pistol of the type or types that the applicant desires to carry as a concealed or unconcealed handgun pursuant to the provisions of the Oklahoma Self-Defense Act, except certain persons may be exempt from such training requirement as provided by the provisions of Section 1290.15 of this title.