Personally I like the Medium. The high ones would work fine, but I do not like my scope that high off the barrel. Those are made for a larger bell on a scope. The Pro Staff is a great scope. I use medium Warne QD rings on both my Knights with that scope. No way would I change. But to each their own. It sounds like the salesman wanted to sell something.

With a long scope you might have to pull the front sights using a medium ring. I am not sure the Disc Extreme even have sights though. I know one of them don't. With the Pro Staff they line up right behind the rear sights.