I noticed that of all the many episodes of GUNSMOKE already on MiniNova, nobody has uploaded most of the other seasons.
So here are two from the early half-hour years (and I have some more to come if you like these):
"Sins of the Father" with Angie Dickinson and Peter Whitney is from 1956, and Angie did a commentary on the separate track that I included for the 50th Anniversary GUNSMOKE DVD set in 2005. She gets in a mention of how different it was riding a horse compared to more contemporary series such as Police Woman and CSI.
Cloris Leachman is in another episode from that same season "Legal Revenge".