Yeah, that is a 3" N from them (or 3.5", too). That is also a 629-1 in the pic, a "Lew Horton" from 1985-ish. Love that gun. I have 4", too, it is a 29-2 c. 1970, nickel. Love it, too.
I have not seen that video of his, I've watched a few of his and he is a great gun guy. In fact, we are...