Butter knife bolt handles are attractive but not great for using. I've actually hurt my hand in operating them. Big balls may be ugly but they function well and on a rifle too. roger

It isn't that the handle interferes, it has to do with the ergonomics of using a bolt handle that is flat, rather than round. With a ball on the end of the bolt handle your hand can comfortably rotate around the ball. With the flat handle you either have to keep it gripped by the flats, requiring awkward hand position or raising the arm higher than usual, OR let your hand rotate and deal with the thin side sections of the handle.

Luckily for me I hate the way they look so dont' even have to debate about getting one.

Red

The "Butterknife" handle would work fine with a "receiver sight"

The sight is on the bridge, how could any bolt handle interfere?