Cortez
Tough but Fair
If you are thinking of changing the bit to this horse before purchase then I'm afraid its not the horse for you
You are assuming that his present owner has him in the correct bit presently then, which may or may not be the case. I try out many horses which are in the wrong bit, which I then change to one which suits better. Nothing wrong with that, and doesn't mean the OP can't ride (or is a troll).