At least be sure of your statements before you post as well.
I am sure because I own 2 cva's a firebolt and a hunterbolt and the hunterbolt has those quote Cr@ppy plastic sights ( which i never had a problem with ) the firebolt i put a set of williams sights on it because when i got the gun the rear sight was removed so a pos trashco scope could fit on it, when i got the rifle from my brother he couldnt find the rear sight.....
I know the rear sight is on a slide ramp....... just have to make sure you have the set screw tightened enough and it wont go anywhere....