I'm not a CAS shooter, but I'll tell you what I think since I do own a Henry. On mine at least, the rear sight is very "floppy". I wondered how good it would be for consistent shot placement. One I got a load I liked, I found with the sight folded down in the normal manner, I could very easily keep a good group to 100 yards. I still have not tried to flip it up and try a few long shots. It would be nice if you could have the correct sight with a spring or something to hold it in position.One of these days, I would like to pop mine off and try to fit something to it. But, like I said, I have no idea about the distances involved in CAS, but from what I understand, with the exception of long range side stuff, the normal sight would be fine.