I'd like to try shooting slugs out of my Nova. How would you go about mounting a ghost ring sight on it. Preferably some sort of flip up. I'm thinking about getting a Carlson 18.5" barrel. Both for slugs and home defense. Right now I only have a 28" barrel. And do the ghost rings have to cost $100!??!?. I paid less than $300 for the whole gun at Bi Mart a couple of years ago (Did I mention I like Bi Mart yet).