Hello. I own a mossberg 500A shotgun and I want to get it ready for bear hunting this September. It has a fixed modified choke barrel, I called mossberg and they said I cannot shoot slugs through that. So I want to purcahse a slug barrel. I hear that rifled slug barrels, although more expensive, are more accurate, correct? Should I get a smooth or rifled slug barrel? What types of sabot/slugs should I use for black bear hunting in northern California? Also, I wanted to get a scope for it, so I am looking for suggesitons on which scopes would work well for me. Please if you have any advice on slug barrels, slugs/sabots or shotgun scopes for bear hunting please let know. Also, I have never hunted black bear before, Where is their vital area? Thanks!!