I bought this gun used from a member here. I took it to the range(50 yards) and I kept hitting high even when I had the rear sight on its lowest notch. Probably 6 inches high still. I am going to scope the rifle but I want iron back ups. I was going to use my xs lever rail and peep but have decided to sell it instead. Is there anything I can do to make my factory sights functional? I am red/green color blind and I love the way my eyes pick up the brass bead on these marlins in hunting conditions. Does my front sight need to be taller or shorter? If shorter can I file the bottom of it? Can I buy a different sight for up front preferably something with a brass bead? Any help greatly appreciated.