Have Gun, Will Travel S04 E24 Fandango

"I don't think you got a very good look at this gun while you had it."

As a favor to an old friend, Paladin captures two teenagers sentenced to hang. Then, he finds himself face-to-face with an old gunfighter who wants the pleasure of hanging the boys who killed his brother. In the end, Paladin wonders how young is too young to be responsible for your crime.