Which of the tv series GUNSMOke did ken curtis play dual roles festus and a gunslinger?

Ken Curtis never played dual roles as Festus and a gunslinger in the TV series "Gunsmoke". Curtis portrayed the beloved, one-eyed deputy Festus Haggen on the show from 1962 until its conclusion in 1975. He did not take on any additional characters during his tenure on "Gunsmoke".