Hmmmm. None that I recall, Pat. Lots of Irish sergeants though! Old westerns with the cavalry involved were almost sure to have one! And yes, they were stereotypical, hot headed, drunken, buffoons which is what makes the Kilrain character so different. His "divine spark" if I may use the term, shows us that he, too, was a man that aspired to greater things than his circumstances might otherwise allow, and he was not anything less than the native born or high born; or better than anyone else including the slave.
The clip you posted pretty much sums up the character that is Buster
I have alway thought that Kilrain represented Shaara and that it was Shaara's way of having a conversation with the characters. He just chose to represent himself as Irish instead of Italian.
I guess both were considered "ethnic" at the time.