charlie brown

I have a CVA Bobcat .50 and do not care for the sights that are on it. They are fixed, and are shooting low and to the right. I don't want to try to compensate for this in the field, so I will be putting new sights on it soon. The barrel is octoganal, so sights that would fit on it without having to drill and tap new holes would be a plus. What is a good set of adjustable open sights that you have had good luck with that you would recommend? I am not planning on shooting past 100 yards at game, so yardage adjustments aren't necessary. any help would be great!